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Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge, depart The Lindo Wing with their newborn son at St Mary's Hospital on July 23, 2013 in London, England. The Duchess of Cambridge yesterday gave birth to a boy at 16.24 BST and weighing 8lb 6oz, with Prince William at her side. The baby, as yet unnamed, is third in line to the throne and becomes the Prince of Cambridge. (Photo by Oli Scarff/Getty Images) ( 174290669 )

Prince William and Catherine, Duchess of Cambridge show their new-born baby boy to the world's media outside the Lindo Wing of St Mary's Hospital in London on July 23, 2013. AFP PHOTO / LEON NEAL/AFP/Getty Images ( 521574703 )

Prince William and Catherine, Duchess of Cambridge show their new-born baby boy to the world's media outside the Lindo Wing of St Mary's Hospital in London on July 23, 2013. AFP PHOTO / LEON NEAL/AFP/Getty Images ( 521574737 )

Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge, depart The Lindo Wing with their newborn son at St Mary's Hospital on July 23, 2013 in London, England. The Duchess of Cambridge yesterday gave birth to a boy at 16.24 BST and weighing 8lb 6oz, with Prince William at her side. The baby, as yet unnamed, is third in line to the throne and becomes the Prince of Cambridge. (Photo by Chris Jackson/Getty Images) ( 174293690 )

Britain's Prince William and his wife Catherine, Duchess of Cambridge appear with their baby son outside the Lindo Wing of St Mary's Hospital, in central London July 23, 2013. REUTERS/Cathal McNaughton ( BRITAIN-ROYAL/ )

Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge, depart The Lindo Wing with their newborn son at St Mary's Hospital on July 23, 2013 in London, England. The Duchess of Cambridge yesterday gave birth to a boy at 16.24 BST and weighing 8lb 6oz, with Prince William at her side. The baby, as yet unnamed, is third in line to the throne and becomes the Prince of Cambridge. (Photo by Chris Jackson/Getty Images) ( 174293677 )

Britain's Prince William holds his baby son outside the Lindo Wing of St Mary's Hospital before leaving with Catherine, Duchess of Cambridge, in central London July 23, 2013. REUTERS/John Stillwell/POOL ( BRITAIN-ROYAL/BABY )

Members of the Honorable Artillery Company (HAC), the City of London's Army Reserve Regiment, fire a 62 gun salute to mark the birth of a new royal baby at the Tower of London in central London on July 23, 2013. International messages of congratulations poured in for the Duke and Duchess of Cambridge following the birth of the third in line to the throne, celebrated by gunfire salutes across London. AFP PHOTO / JUSTIN TALLIS/AFP/Getty Images ( 521567824 )

A handout picture issued from Britain's Ministry of Defence on July 23, 2013, shows crew members of the British warship HMS LANCASTER celebrating the birth of Prince William and Catherine, Duchess of Cambridge's baby whilst on patrol in the Caribbean. Britain's new baby prince follows his father and late grandmother by being born under the zodiac sign of Cancer, suggesting he will be a strong leader, according to astrologists. Jay Allen/MINISTRY OF DEFENCE/HOL(PHOT) JAY ALLEN/AFP/Getty Images ( 521562690 )

A celebratory ale is sold in pub to mark the birth of the first born son of the Duke and Duchess of Cambridge on July 23, 2013 in London, England. Catherine, Duchess of Cambridge yesterday gave birth to a boy at 16.24 BST and weighing 8lb 6oz, with Prince William, Duke of Cambridge at her side. The baby, as yet unnamed, is third in line to the throne and becomes the Prince of Cambridge. (Photo by Warrick Page/ Getty Images) ( 174296101 )

Prince William and Catherine, Duchess of Cambridge show their new-born baby boy to the world's media outside the Lindo Wing of St Mary's Hospital in London on July 23, 2013. The baby was born on Monday afternoon weighing eight pounds six ounces (3.8 kilogrammes). The baby, titled His Royal Highness, Prince (name) of Cambridge, is directly in line to inherit the throne after Charles, Queen Elizabeth II's eldest son and heir, and his eldest son William. ANDREW COWIE/AFP/Getty Images ( 521574381 )

A young well wisher waits outside The Lindo Wing as he awaits Catherine, Duchess Of Cambridge and her newborn son at on July 23, 2013 in London, England. The Duchess of Cambridge yesterday gave birth to a boy at 16.24 BST and weighing 8lb 6oz, with Prince William at her side. The baby, as yet unnamed, is third in line to the throne and becomes the Prince of Cambridge. (Photo by Scott Heavey/Getty Images) ( 174293539 )

Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge, depart The Lindo Wing with their newborn son at St Mary's Hospital on July 23, 2013 in London, England. The Duchess of Cambridge yesterday gave birth to a boy at 16.24 BST and weighing 8lb 6oz, with Prince William at her side. The baby, as yet unnamed, is third in line to the throne and becomes the Prince of Cambridge. (Photo by Scott Heavey/Getty Images) ( 174291215 )

Britain's Prince William and his wife Catherine, Duchess of Cambridge appear with their baby son, as they stand outside the Lindo Wing of St Mary's Hospital, in central London July 23, 2013. REUTERS/Stefan Wermuth ( BRITAIN-ROYAL/ )

Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge leave the Lindo Wing of St Mary's Hospital with their newborn son on July 23, 2013 in London, England. The Duchess of Cambridge yesterday gave birth to a boy at 16.24 BST and weighing 8lb 6oz, with Prince William at her side. The baby, as yet unnamed, is third in line to the throne and becomes the Prince of Cambridge. (Photo by Oli Scarff/Getty Images) ( 174293071 )

Prince William and Catherine, Duchess of Cambridge's new-born baby boy is introduced to the world's media outside the Lindo Wing of St Mary's Hospital in London on July 23, 2013. The baby was born on Monday afternoon weighing eight pounds six ounces (3.8 kilogrammes). The baby, titled His Royal Highness, Prince (name) of Cambridge, is directly in line to inherit the throne after Charles, Queen Elizabeth II's eldest son and heir, and his eldest son William. CARL COURT/AFP/Getty Images ( 521573036 )

Britain's Kate Duchess of Cambridge waves as she gets in a vehicle to leave, Tuesday July 23, 2013, after posing with her husband Prince William and their newly born baby son for photographers outside St. Mary's Hospital exclusive Lindo Wing in London where the Duchess gave birth on Monday July 22. The Royal couple are expected to head to Londonís Kensington Palace from the hospital with their newly born son, the third in line to the British throne. (AP Photo/Matt Dunham) ( Britain Royal Baby )

Catherine, Duchess of Cambridge (L) waves as she is driven by her husband, WIlliam, the Duke of Cambridge away from Lindo Wing of St Mary's Hospital in London on July 23, 2013. Her baby was born on Monday afternoon weighing eight pounds six ounces (3.8 kilogrammes). The baby is directly in line to inherit the throne after Charles, Queen Elizabeth II's eldest son and heir, and his eldest son William. ANDREW COWIE/AFP/Getty Images ( 521573583 )

Prince William drives Catherine, Duchess of Cambridge and their new-born baby boy back to Kensington Palace in London on July 23, 2013. The baby was born on Monday afternoon weighing eight pounds six ounces. The royal couple have led a relatively simple married life until now at a farmhouse in Wales close to William's airbase, though after the birth they will move into London's Kensington Palace, which has been refurbished at a cost of £1 million of British taxpayers' money. WILL OLIVER/AFP/Getty Images ( 521574933 )

Britain's Prince Charles and his wife Camilla, Duchess of Cornwall arrive at the Lindo Wing of St Mary's Hospital the day after Catherine, Duchess of Cambridge, gave birth to a baby boy, in London July 23, 2013. REUTERS/Suzanne Plunkett ( BRITAIN-ROYAL/BABY )

Britain's Queen Elizabeth II is pictured at a reception for the Winners of the Queens Award for Enterprise 2013 at Buckingham Palace in London, on July 23, 2013. Britain's Prince William and his wife Kate proudly showed off their newborn baby son to the world for the first time on Tuesday, cradling the future king in their arms as they left hospital to go home. PHILIP TOSCANO/AFP/Getty Images ( ARP3597661 )

Carole and Michael Middleton, the parents of Kate, Duchess of Cambridge, smile as they arrive at St. Mary's Hospital's exclusive Lindo Wing in London on Tuesday, July 23, 2013, where the Duchess gave birth Monday. The royal couple are expected to head to Kensington Palace from the hospital with their newborn son, the third in line to the British throne. (AP Photo/Lefteris Pitarakis) ( APTOPIX Britain Royal Baby )

Newspaper front pages report news of the birth of a new royal baby in London on July 23, 2013. International messages of congratulations poured in for the Duke and Duchess of Cambridge following the birth of the third in line to the throne, celebrated by gunfire salutes across London. AFP PHOTO / WILL OLIVER/AFP/Getty Images ( 521570244 )

A boy runs past a sculpture created by Indian sand artist Sudarshan Pattnaik to mark the birth of Britain's royal baby, on a beach in Puri, located in the eastern Indian state of Odisha, July 23, 2013. REUTERS/Stringer ( BRITAIN-ROYAL/ )

The safe hands of Catherine, Duchess of Cambridge holding her new-born baby boy in front of the world's media outside the Lindo Wing of St Mary's Hospital in London on July 23, 2013. The baby was born on Monday afternoon weighing eight pounds six ounces. The baby is directly in line to inherit the throne after Charles, Queen Elizabeth II's eldest son and heir, and his eldest son William. CARL COURT/AFP/Getty Images ( 521573818 )

Britain's Catherine, Duchess of Cambridge, holds her baby son outside the Lindo Wing of St Mary's Hospital before leaving with Prince William, in central London July 23, 2013. Kate gave birth to the couple's first child, who is third in line to the British throne, on Monday afternoon, ending weeks of feverish anticipation about the arrival of the royal baby. REUTERS/John Stillwell/POOL ( BRITAIN-ROYAL/BABY )

Prince William and Catherine, Duchess of Cambridge show their new-born baby boy to the world's media, on the steps outside the Lindo Wing of St Mary's Hospital in London on July 23, 2013. The baby was born on Monday afternoon weighing eight pounds six ounces (3.8 kilograms). The baby, titled His Royal Highness, Prince (name) of Cambridge, is directly in line to inherit the throne after Charles, Queen Elizabeth II's eldest son and heir, and his eldest son William. AFP PHOTO / LEON NEAL/AFP/Getty Images ( 521572816 )

Britain's Prince William and Kate, Duchess of Cambridge hold the Prince of Cambridge, Tuesday July 23, 2013, as they pose for photographers outside St. Mary's Hospital exclusive Lindo Wing in London where the Duchess gave birth on Monday July 22. The Royal couple are expected to head to Londonís Kensington Palace from the hospital with their newly born son, the third in line to the British throne. (AP Photo/Lefteris Pitarakis) ( Britain Royal Baby )

Prince William and Catherine, Duchess of Cambridge show their new-born baby boy to the world's media, leaving the Lindo Wing of St Mary's Hospital in London on July 23, 2013. The baby was born on Monday afternoon weighing eight pounds six ounces (3.8 kilogrammes). The baby, titled His Royal Highness, Prince (name) of Cambridge, is directly in line to inherit the throne after Charles, Queen Elizabeth II's eldest son and heir, and his eldest son William. AFP PHOTO / LEON NEALLEON NEAL/AFP/Getty Images ( ARP3597337 )

Prince William, Duke of Cambridge leaves the Lindo Wing of St Mary's Hospital with his newborn son on July 23, 2013 in London, England. The Duchess of Cambridge yesterday gave birth to a boy at 16.24 BST and weighing 8lb 6oz, with Prince William at her side. The baby, as yet unnamed, is third in line to the throne and becomes the Prince of Cambridge. (Photo by Oli Scarff/Getty Images) ( 174291570 )

Chelsea pensioners toast the birth of a baby boy born to Britain's Prince William and Catherine, Duchess of Cambridge at the Royal Chelsea Hospital in London July 23, 2013. REUTERS/Neil Hall ( BRITAIN-ROYAL/BABY )

Guardsmen take part in the Changing of the Guard outside Buckingham Palace in central London on July 23, 2013. International messages of congratulations poured in for the Duke and Duchess of Cambridge following the birth of the third in line to the throne, celebrated by gunfire salutes across London. AFP PHOTO / WILL OLIVER/AFP/Getty Images ( 521567952 )

Members of the Kings Troop Royal Horse Artillery fire a 41 gun salute to mark the birth of the new royal baby, in The Green Park, central London on July 23, 2013. International messages of congratulations poured in for the Duke and Duchess of Cambridge following the birth of the third in line to the throne, celebrated by gunfire salutes across London. AFP PHOTO / WILL OLIVER/AFP/Getty Images ( 521568221 )

A smoke ring is seen as the King's Troop Royal Horse Artillery fire a 41 Royal Gun Salute in Green Park, to mark the birth of a baby boy of Prince William and Kate, Duchess of Cambridge, in London, Tuesday, July 23, 2013. (AP Photo / Sang Tan) ( Britain Royal Baby )

Photographers take pictures of The Duchess of Cambridge's parents Carole and Michael Middleton as they arrive at the Lindo Wing of St Mary's Hospital in London, to meet their new grandson Tuesday, July 23, 2013. Prince William, Kate and their baby boy were spending their first full day as a family Tuesday inside a London hospital, thanking staff for their care but making well-wishers wait for a first glimpse of the royal heir. (AP Photo / Steve Parsons/PA) ( Britain Royal Baby )

Kate, Duchess of Cambridge holds the Prince of Cambridge, Tuesday July 23, 2013, as she poses for photographers outside St. Mary's Hospital exclusive Lindo Wing in London where the Duchess gave birth on Monday July 22. (AP Photo/Lefteris Pitarakis) ( Britain Royal Baby )

Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge, depart The Lindo Wing with their newborn son at St Mary's Hospital on July 23, 2013 in London, England. The Duchess of Cambridge yesterday gave birth to a boy at 16.24 BST and weighing 8lb 6oz, with Prince William at her side. The baby, as yet unnamed, is third in line to the throne and becomes the Prince of Cambridge. (Photo by Oli Scarff/Getty Images) ( 174290644 )

The fountains at Trafalgar Square are seen lit blue to signify the birth of a baby boy to Britain's Prince William and Catherine, Duchess of Cambridge in London July 22, 2013. Prince William's wife Kate gave birth, in the Lindo Wing of St Mary's Hospital, on Monday to a baby boy who becomes third in line to the British throne. The royal baby, the couple's first child, was born at 4:24 p.m., weighing 8 lbs and 6 oz. REUTERS/Neil Hall ( BRITAIN/ )

A police officer tries to control a crowd of people trying to get to the railing to take pictures of a notice proclaiming the birth of a baby boy to Prince William and Kate, Duchess of Cambridge on display for public view at Buckingham Palace in London, Monday, July 22, 2013. (AP Photo/Sang Tan) ( Britain Royal Baby )

Members of the public celebrate outside Buckingham Palace after an easel was placed in the forecourt of the Palace with the notification to announce the birth of a baby boy, at 4.24pm to the Duke and Duchess of Cambridge at St Mary's Hospital in west London, Monday July 22, 2013.(AP Photo/Clive Gee, PA) ( Britain Royal Baby )

A Town Crier reads an announcement about the birth of a baby boy at 4.24pm to Prince William and Catherine, Duchess of Cambridge, outside the Lindo Wing of St Mary's Hospital in London, on July 22, 2013. Prince William's wife Kate gave birth to a baby boy today, providing Britain's royal family with a future king in an event that had been anticipated around the world, Kensington palace said. ANDREW COWIE/AFP/Getty Images ( 521564988 )

A notice formally announcing the birth of a son to Britain's Prince William and Catherine, Duchess of Cambridge, is placed in the forecourt of Buckingham Palace, in central London July 22, 2013. Prince William's wife Kate gave birth on Monday to a baby boy, in the Lindo Wing of St Mary's Hospital, who becomes third in line to the British throne, his office said. The royal baby, the couple's first child, was born at 4:24 p.m. (1524 GMT), weighing 8 lbs and 6 oz. REUTERS/Neil Hall ( BRITAIN-ROYAL/BABY )

A Jaguar car is driven into the Forecourt of Buckingham Palace bringing the news to announce the birth of a baby boy, at 4.24pm to the Duke and Duchess of Cambridge at St Mary's Hospital on July 22, 2013 in London, England. (Photo by John Stillwell/WPA Pool/Getty Images) ( 174244750 )

The Queen's Press Secretary Ailsa Anderson with Badar Azim, a footman, places an official document to announce the birth of a baby boy, at 4.24pm to the William and Kate, the Duke and Duchess of Cambridge at St Mary's Hospital, in the forecourt of Buckingham Palace in London Monday July 22, 2013. The child is now third in line to the British throne. (AP Photo/John Stillwell, Pool) ( APTOPIX Britain Royal Baby )

Look-alikes of Catherine, Duchess of Cambridge and William, Duke of Cambridge are removed from the steps of the Lindo Wing of St Mary's Hospital in London, on July 19, 2013, where Prince William and his wife Catherine's baby is expected to be born. The long wait for the birth of Britain's royal baby is record business for bookmakers, as punters worldwide bet on a girl called Alexandra to be born any day now. LEON NEAL/AFP/Getty Images ( 521471063 )

A look-alike of Catherine, Duchess of Cambridge becomes the centre of attention for the assembled media outside the Lindo Wing of St Mary's Hospital in London, on July 19, 2013, where Prince William and his wife Catherine's baby is expected to be born. The long wait for the birth of Britain's royal baby is record business for bookmakers, as punters worldwide bet on a girl called Alexandra to be born any day now. LEON NEAL/AFP/Getty Images ( 521471011 )

A group of women pose with Duchess of Cambridge masks outside the Lindo Wing of St Mary's Hospital, where Britain's Catherine, Duchess of Cambridge is expected to give birth, in London July 18, 2013. The first child of Prince William and his wife Kate is due in July, with the couple saying they have no idea of the sex of the royal baby, who will be third in line to the British throne. REUTERS/Paul Hackett ( BRITAIN-ROYAL/BABY )

A girl from a Betting Company wears a board highlighting the latest odds on babies names outside the Lindo wing of St Mary's Hospital as the UK prepares for the birth of the first child of The Duke and Duchess of Cambridge on July 16, 2013 in London, England. (Photo by Chris Jackson/Getty Images) ( 173718387 )

Royal Supporter Terry Hutt reads a newspaper announcing the birth of the newest member of Britain's royal family outside St Mary's Hospital in London, on July 23, 2013. Britain's new baby prince follows his father and late grandmother by being born under the zodiac sign of Cancer, suggesting he will be a strong leader, according to astrologists. AFP PHOTO / JUSTIN TALLIS/AFP/Getty Images ( 521566977 )

The children's book 'Shhh! Don't Wake the Royal Baby!' in Waterstones bookshop on July 17, 2013 in London, England. The birth of the first child of The Duke and Duchess of Cambridge is expected in the next few days. (Photo by Oli Scarff/Getty Images) ( 173732658 )

Representatives from a betting company wear baby masks as they perform a publicity stunt outside St. Mary's Hospital in London, Friday, July 12, 2013. Media are preparing for royal-mania as Britain's Kate, Duchess of Cambridge is expected to give birth to the new third-in-line to the throne in mid-July, at the Lindo Wing. Cameras from all over the world are set to be jostling outside for an exclusive first glimpse of Britain's Prince William and the Duchess of Cambridge's first child. (AP Photo/Matt Dunham) ( Britain Royal Baby )

Artist Kaya Mar poses with paintings of Britain's Queen Elizabeth II (R) and Catherine (L), Duchess of Cambridge, outside the Lindo Wing of Saint Mary's Hospital in London, on July 12, 2013, where Prince William and his wife Catherine's baby will be born. Britain's royal family and the world's media are on tenterhooks awaiting the birth of Prince William and wife Catherine's first child, a baby who will one day be king or queen of Britain and a diverse group of commonwealth countries. CARL COURT/AFP/Getty Images ( 521305112 )

A clock in the press pen shows the time outside the Lindo Wing of St Mary's Hospital, where Britain's Catherine, Duchess of Cambridge is due to give birth, in London July 15, 2013. The first child of Prince William and his wife Kate is due in mid-July, with the couple saying they have no idea of the sex of the baby, who will be third in line to the British throne. REUTERS/Olivia Harris ( BRITAIN/ )

Members of the public take photos in front of the Lindo Wing of St Mary's Hospital, where Britain's Catherine, Duchess of Cambridge, is due to give birth in Paddington, London, July 14, 2013. REUTERS/Olivia Harris ( BRITAIN/ )

A member of the U.S. media decides which baby clothes to show to the camera outside the Lindo Wing of St Mary's Hospital, where Britain's Catherine, Duchess of Cambridge is due to give birth, in London July 15, 2013. The first child of Prince William and his wife Kate is due in mid-July, with the couple saying they have no idea of the sex of the baby, who will be third in line to the British throne. REUTERS/Olivia Harris ( BRITAIN/ )

Britain's Prince William (R) rides onto the pitch with the opposing team at the start of the Jerudong Trophy polo match at Cirencester Park Polo Club near Cirencester in central England July 14, 2013. REUTERS/Luke MacGregor ( BRITAIN/ )

A man dressed as a member of the queen's guard poses beside a parking space reserved for the prospective prince or princess on July 11, 2013, as the Duke and Duchess of Cambridge prepare for the birth of their first child. The supermarket, on the island of Anglesey is situated near to the home that the Duke and Duchess of Cambridge share. (Photo by Richard Birch/Asda via Getty Images) ( 173302035 )

Promotions manager Daniel Obando wears a baby doll wrapped in union flag decorations as he stands in Piccadilly as the UK prepares for the birth of the first child of the Duke and Duchess of Cambridge on July 12, 2013 in London, England. (Photo by Peter Macdiarmid/Getty Images) ( 173489652 )

Britain's Prince William, the Duke of Cambridge, (L) poses for pictures with his wife Catherine, Duchess of Cambridge, as they leave the King Edward VII hospital in central London, on December 6, 2012. Prince William's pregnant wife Catherine left a London hospital on Thursday, four days after she was admitted for treatment for acute morning sickness. LEON NEAL/AFP/Getty Images ( DV1363222 )

Britain's Prince William, Duke of Cambridge, leaves the King Edward the VII hospital in London on December 3, 2012, where his wife Catherine, the Duchess of Cambridge, is resting for suffering from severe morning sickness. Prince William and his wife Catherine announced they are expecting their first child, ending fevered speculation about a baby destined to become Britain's monarch whether it is a boy or a girl. JUSTIN TALLIS/AFP/Getty Images ( DV1361231 )

Police officers stand guard outside King Edward the VII hospital in London on December 3, 2012, where Catherine, the Duchess of Cambridge, is resting for suffering severe morning sickness. Prince William's wife Catherine is pregnant with their first child, St James's Palace said, in an eagerly awaited announcement about a baby destined to be Britain's future king or queen. JUSTIN TALLIS/AFP/Getty Images ( DV1361169 )

King Edward the VII hospital in London on December 3, 2012, where Catherine, the Duchess of Cambridge, is resting after suffering severe morning sickness. Prince William's wife Catherine is pregnant with their first child, St James's Palace said, in an eagerly awaited announcement about a baby destined to be Britain's future king or queen. JUSTIN TALLIS/AFP/Getty Images ( DV1361170 )

Britain's Catherine, Duchess of Cambridge, arrives at the Hope House charity in south London on February 19, 2013. British novelist Hilary Mantel faced criticism after describing Prince William's wife Catherine as a "shop window mannequin" with a "plastic smile" whose only purpose is to breed. ANDREW COWIE/AFP/Getty Images ( DV1417969 )

Catherine, Duchess of Cambridge receives flowers from Hugh and Serena Woodford as she visits Hope House residential centre, run by Action on Addiction for recovering addicts on February 19, 2013 in London, England. The Duchess, who is patron of the centre spent over an hour talking to residents at the centre, on her first public engagement since early January. (Photo by Mary Turner - WPA Pool/Getty Images) ( 73405006 )

Catherine, Duchess of Cambridge, Prince William, Duke of Cambridge and Prince Charles visit Dumfries House on March 05, 2013 in Ayrshire, Scotland. The Duke and Duchess of Cambridge braved the bitter cold to attend the opening of an outdoor centre in Scotland today. The couple joined the Prince of Wales at Dumfries House in Ayrshire where Charles has led a regeneration project since 2007. Hundreds of locals and 600 members of youth groups including the Girl Guides and Scouts turned out for the official opening of the Tamar Manoukin Outdoor Centre. (Photo by Danny Lawson - WPA Pool/Getty Images) ( 74052643 )

British artist Paul Emsley poses in front of his portrait of Catherine, The Duchess of Cambridge after its unveiling at the National Portrait Gallery in central London on January 11, 2013. This is the first official portrait of the Duchess and was completed after two sittings at the artist's studio and Kensington Palace. LEON NEAL/AFP/Getty Images) ( DV1377702 )

Catherine, Duchess of Cambridge, Prince William, Duke of Cambridge and Prince Charles visit Dumfries House on March 05, 2013 in Ayrshire, Scotland. The Duke and Duchess of Cambridge braved the bitter cold to attend the opening of an outdoor centre in Scotland today. The couple joined the Prince of Wales at Dumfries House in Ayrshire where Charles has led a regeneration project since 2007. Hundreds of locals and 600 members of youth groups including the Girl Guides and Scouts turned out for the official opening of the Tamar Manoukin Outdoor Centre. (Photo by Danny Lawson - WPA Pool/Getty Images) ( 74053013 )

A young boy picks his nose as he talks to Catherine, Duchess of Cambridge during her visit to Peaks Lane fire station in Grimsby, northern England on March 5, 2013. The Duchess of Cambridge is on an official visit to Grimsby during which she visited the National Fishing Heritage Centre and will meet with unemployed teenagers. Photo credit should read LEON NEAL/AFP/Getty Images ( DV1430836 )

Catherine, Duchess of Cambridge attends a St Patrick's Day parade by the 1st Battalion Irish Guards as she visits Aldershot Barracks on St Patrick's Day on March 17, 2013 in Aldershot, England. (Photo by Ben Pruchnie/Getty Images) ( 73826221 )

Catherine, Duchess of Cambridge (R) meets three-year-old Isobelle Laursen during a visit to Peaks Lane fire station in Grimsby, northern England on March 5, 2013. The Duchess of Cambridge is on an official visit to Grimsby during which she visited the National Fishing Heritage Centre and will meet with unemployed teenagers. Photo credit should read LEON NEAL/AFP/Getty Images ( DV1430834 )

Catherine, Duchess of Cambridge arrives at the National Fishing Heritage Centre on March 5, 2013 in Grimsby, England. The pregnant Duchess of Cambridge is spending the day visiting Grimsby in the North East of England. (Photo by Chris Jackson/Getty Images) ( 73644860 )

Britain's Catherine, Duchess of Cambridge, and her husband, Prince William (Front 2nd L), pose for an official photograph as they attend St Patrick's Day Parade at Mons Barracks in Aldershot, southern England, on March 17, 2013. Prince William attended the Parade as Colonel of the Regiment, and the Duchess presented the traditional sprigs of shamrocks to the Officers and Guardsmen of the Regiment. TOBY MELVILLE/AFP/Getty Images ( DV1441479 )

Catherine, Duchess of Cambridge chats to the bereavement services team as she visits the offices of Child Bereavement UK on March 19, 2013 in Saunderton, Buckinghamshire. (Photo by Paul Edwards - WPA Pool/Getty Images) ( 73851868 )

Catherine, Duchess of Cambridge meets members of the public as she visits the offices of Child Bereavement UK on March 19, 2013 in Saunderton, Buckinghamshire. (Photo by Paul Edwards - WPA Pool/Getty Images) ( 73851877 )

Britain's Catherine, Duchess of Cambridge, visits the offices of Child Bereavement, in Saunderton, Buckinghamshire, on March 19, 2013. PAUL EDWARDS/AFP/Getty Images ( DV1443126 )

Britain's Catherine, Duchess of Cambridge, wears a Transport For London (TFL) badge that reads "baby on board", given to her during a visit to Baker Street tube station with Queen Elizabeth II and Prince Philip, Duke of Edinburgh, in London on March 20, 2013 to mark 150th anniversary of the London underground. The 86-year-old queen attended her first public engagement for more than a week after she had to cancel a number of events last week as she was still recovering from a bout of gastroenteritis which saw her admitted to hospital on March 3 for the first time in ten years. Chris Radburn/AFP/Getty Images ( DV1443387 )

Catherine, Duchess of Cambridge (C) offers assistance in firelighting during a visit to the Great Tower Scout camp at Newby Bridge in Cumbria on March 22, 2013. The Duchess braved snowy conditions to pay a visit to the scout camp. ANDY STENNING/AFP/Getty Images ( DV1444704 )

Catherine, Duchess of Cambridge, visits Great Tower Scout camp on March 22, 2013 in Windermere, Cumbria, United Kingdom. The Duchess of Cambridge attended a scout volunteer training day today in Newby Bridge in Cumbria. The training course is being run in Great Tower, one of the Scout Association's national activity centers set in 250 acres of land offering a wide range of land and water based activities, including archery, low and high ropes, climbing, abseiling, sailing and canoeing. (Photo by Andy Stenning WPA - Pool/Getty Images) ( 73902536 )

Britain's Catherine, Duchess of Cambridge, plays table tennis against Britain's Prince William, Duke of Cambridge, during a visit to the Donald Dewer Leisure centre in Glasgow, Scotland on April 4, 2013. The Duke and Duchess of Cambridge, known as the Earl and Countess of Strathearn in Scotland, visited the Donald Dewer Leisure to launch a new Scottish project for their foundation. DAVID CHESKIN/AFP/Getty Images ( DV1451585 )

Prince William, Earl of Strahearn and Catherine, Countess of Strathearn visit the Emirates Arena on April 4, 2013 in Glasgow, Scotland. The Emirates Arena will play host to several events at the 2014 Glasgow Commonwealth Games. (Photo by Chris Jackson/Getty Images) ( 164821868MT00008_The_Earl_A )

Britain's Catherine, Duchess of Cambridge (L) attends the National Review of Queen's Scouts at Windsor Castle in Berkshire on April 21, 2013. The event celebrates the achievements of young people and young adults who have achieved the Queen's Scout award. This award is gained by carrying out regular community service for a year, learning new skills, completing a four day expedition in unknown terrain; taking part in a residential project and then sharing what has been learned with their peers. OLIVIA HARRIS/AFP/Getty Images) ( ARP3500367 )

Catherine, Countess of Strathearn arrives at the Astute-class Submarine Building at BAE Systems on April 5, 2013 in Barrow-in-Furness, United Kingdom. The Duke of Cambridge is Commodore-in-Chief of the Royal Navy Submarine Service and during their visit they will tour the offices of Vanguard replacement programme and meet with the crew of Artful and their families, who are now based in Barrow. (Photo by Chris Jackson-Pool/Getty Images) ( 164821868SJ00006_The_Earl_A )

Catherine, Duchess of Cambridge (R), is presented with a gift for her dog Lupo as she meets the school dog Henry as she arrives to visit The Willows Primary School, Wythenshawe to launch a new school counseling program on April 23, 2013 in Manchester, England. The Duchess of Cambridge met staff and volunteers, teachers and parents at the school as she launched the program which is a partnership between the Royal Foundation, Comic Relief, Place2Be and Action on Addiction. (Photo by Paul Ellis - WPA Pool/Getty Images) ( 74328140 )

Catherine, Duchess of Cambridge views a painting of her husband Prince William and brother-in-law Prince Harry accompanied by National Portrait Gallery director Sandy Nairne (L) and Art Room charity founder Juli Beattie (R) during an evening reception to celebrate the work of The Art Room charity at The National Portrait Gallery on April 24, 2013 in London, England. (Photo by Toby Melville/WPA Pool/Getty Images) ( 74347304 )

Prince Harry, Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge raise their wands on the set used to depict Diagon Alley in the Harry Potter Films during the Inauguration Of Warner Bros. Studios Leavesden on April 26, 2013 in London, England. (Photo by Paul Rogers - WPA Pool/Getty Images) ( 74385049 )

Catherine, The Duchess of Cambridge (2-L) and Prince Harry arrive for a visit at the Warner Brother's studio in Leavesden on April 26, 2013. Chris Jackson/AFP/Getty Images) ( ARP3504136 )

Catherine, The Duchess Of Cambridge meets children and staff during a visit to Naomi House Children's Hospice on April 29, 2013 near Winchester, Hampshire, England. (Photo by David Parker/WPA Pool/Getty Images) ( 74429253 )

Catherine, Duchess Of Cambridge visits Naomi House on April 29, 2013 in Hampshire, England. (Photo by Eamonn M. McCormack/Getty Images) ( 74428344 )

Prince Charles, the Prince of Wales (L), Camilla, the Duchess of Cornwall (C) and Catherine, the Duchess of Cambridge attend a Garden Party in the grounds of Buckingham Palace, central London on May 22, 2013. JOHN STILLWELL/AFP/Getty Images ( ARP3528780 )

Britain's Prince William, (Front L) and his wife Catherine, Duchess of Cambridge, (C) speak outside Westminster Abbey in London, on June 4, 2013, after attending a service to celebrate the 60th anniversary of the Coronation Service. Queen Elizabeth II, now 87, took the throne on February 6, 1952 upon the death of her father king George VI, but to allow for a period of national mourning she was only crowned on June 2, 1953 in London's Westminster Abbey. LEON NEAL/AFP/Getty Images ( ARP3540941 )

A display of plates, part of an assortment of souvenir gifts celebrating the upcoming birth of the royal baby of Prince William, Duke of Cambridge and Catherine, the Duchess of the Cambridge on sale in a Souvenir outlet in central London on June 26, 2013. The baby is expected to arrive in mid-July, with the mother likely to opt for a natural delivery. The baby, which will be third in line to the throne, will be born in the same London hospital wing where William himself was born to Prince Charles and Princess Diana. WILL OLIVER/AFP/Getty Images ( ARP3567251 )

A shopper views souvenir gifts celebrating the upcoming birth of the royal baby of Prince William, Duke of Cambridge and Catherine, the Duchess of the Cambridge on sale in a Souvenir outlet in central London on June 26, 2013. The baby is expected to arrive in mid-July, with the mother likely to opt for a natural delivery. The baby, which will be third in line to the throne, will be born in the same London hospital wing where William himself was born to Prince Charles and Princess Diana. WILL OLIVER/AFP/Getty Images ( ARP3567241 )

Crew look on as Captain Tony Draper (2nd-L) gives Catherine, Duchess of Cambridge a tour on board the Princess Cruises ship during its naming ceremony at Ocean Terminal on June 13, 2013 in Southampton, England. (Photo by Chris Jackson- WPA Pool/Getty Images) ( 75076760 )

(L-R) Captain Tony Draper, Catherine, Duchess of Cambridge and President and CEO of Princess Cruises Alan Buckelew arrive for the Princess Cruises ship naming ceremony at Ocean Terminal on June 13, 2013 in Southampton, England. (Photo by Chris Jackson- WPA Pool/Getty Images) ( 75077043 )

Ticker tape falls as Britain's Catherine, Duchess of Cambridge (R) officially names Princess Cruises's new ship 'Royal Princess' in Southampton, southern England on June 13, 2013. The Duchess of Cambridge, as the ship's godmother, officially named the Royal Princess with a traditional blessing involving smashing a bottle over the ship's hull in what is expected to her final solo engagement before the birth of her and Prince William's child. BEN STANSALL/AFP/Getty Images ( ARP3551029 )

Prince Harry, Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge on the balcony of Buckingham Palace during the annual Trooping the Colour Ceremony on June 15, 2013 in London, England. Today's ceremony which marks the Queens official birthday will not be attended by Prince Philip the Duke of Edinburgh as he recuperates from abdominal surgery and will also be The Duchess of Cambridge's last public engagement before her baby is due to be born next month. (Photo by Chris Jackson/Getty Images) ( 75116869 )