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Catherine, Duchess of Cambridge waves her wand 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. ( 167539752 )

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) ( 167531549 )

Britain's Kate the Duchess of Cambridge with her husband Prince William and his brother Prince Harry, not pictured, attend the inauguration of "Warner Bros. Studios Leavesden" near Watford, approximately 18 miles north west of central London, Friday, April 26, 2013. As well as attending the inauguration Friday at the former World War II airfield site, the royals will undertake a tour of Warner Bros. "Studio Tour London - The Making of Harry Potter", where they will view props, costumes and models from the Harry Potter film series. (AP Photo/Chris Jackson, Pool) ( Britain Royal Warner Bros. )

Prince Harry and Prince William, Duke of Cambridge attend the Inauguration Of Warner Bros. Studios Leavesden on April 26, 2013 in London, England. (Photo by Paul Rogers - WPA Pool/Getty Images) ( 167531499 )

Britain's Kate the Duchess of Cambridge arrives with her husband Prince William, not pictured and his brother Prince Harry, rear right, to attend the inauguration of "Warner Bros. Studios Leavesden" near Watford, approximately 18 miles north west of central London, Friday, April 26, 2013. (AP Photo/Chris Jackson, Pool) ( Britain Royal Warner Bros. )

Prince Harry (R) and Prince William, Duke of Cambridge inspect the 'Tumbler', a vehicle used in the Batman films during the Inauguration Of Warner Bros. Studios Leavesden on April 26, 2013 in London, England. (Photo by Paul Rogers - WPA Pool/Getty Images) ( 167531527 )

Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge attend the Inauguration Of Warner Bros. Studios Leavesden on April 26, 2013 in London, England. (Photo by Paul Rogers - WPA Pool/Getty Images) ( 167531493 )

Prince William, Duke of Cambridge makes a speech at the Inauguration Of Warner Bros. Studios Leavesden on April 26, 2013 in London, England. (Photo by Paul Rogers - WPA Pool/Getty Images) ( 167531511 )

Britain's Kate the Duchess of Cambridge watches her husband Prince William as he sits on the 'Batpod' during the inauguration of "Warner Bros. Studios Leavesden" near Watford, approximately 18 miles north west of central London, Friday, April 26, 2013. (AP Photo/Chris Jackson, Pool) ( APTOPIX Britain Royal Warner Bros. )

Catherine, Duchess of Cambridge arrives at the Inauguration Of Warner Bros. Studios Leavesden on April 26, 2013 in London, England. (Photo by Paul Rogers - WPA Pool/Getty Images) ( 167531538 )

Catherine, Duchess of Cambridge and Prince Harry arrive at the Inauguration Of Warner Bros. Studios Leavesden on April 26, 2013 in London, England. (Photo by Paul Rogers - WPA Pool/Getty Images) ( 167532643 )

Prince William, Duke of Cambridge site the 'Batpod', which was used in the Batman films as Catherine, Duchess of Cambridge and Prince Harry look on during the Inauguration Of Warner Bros. Studios Leavesden on April 26, 2013 in London, England. (Photo by Paul Rogers - WPA Pool/Getty Images) ( 167533633 )

Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge attend the Inauguration Of Warner Bros. Studios Leavesden on April 26, 2013 in London, England. (Photo by Paul Rogers - WPA Pool/Getty Images) ( 167533636 )

Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge arrive at the Inauguration Of Warner Bros. Studios Leavesden on April 26, 2013 in London, England. (Photo by Paul Rogers - WPA Pool/Getty Images) ( 167539749 )

Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge attend the Inauguration Of Warner Bros. Studios Leavesden on April 26, 2013 in London, England. (Photo by Paul Rogers - WPA Pool/Getty Images) ( 167539753 )

Prince William, Duke of Cambridge holds a Clapper Board at the Inauguration Of Warner Bros. Studios Leavesden on April 26, 2013 in London, England. (Photo by Paul Rogers - WPA Pool/Getty Images) ( 167539755 )

Prince Harry and Prince William, Duke of Cambridge inspect the Batman costume during the Inauguration Of Warner Bros. Studios Leavesden on April 26, 2013 in London, England. (Photo by Paul Rogers - WPA Pool/Getty Images) ( 167539757 )

Catherine, Duchess of Cambridge speaks with children during the Inauguration Of Warner Bros. Studios Leavesden on April 26, 2013 in London, England. (Photo by Paul Rogers - WPA Pool/Getty Images) ( 167539764 )

Prince William, Duke of Cambridge site the 'Batpod', which was used in the Batman films as he attends the Inauguration Of Warner Bros. Studios Leavesden on April 26, 2013 in London, England. (Photo by Paul Rogers - WPA Pool/Getty Images) ( 167539765 )

Catherine, Duchess of Cambridge arrives at the Inauguration Of Warner Bros. Studios Leavesden on April 26, 2013 in London, England. (Photo by Paul Rogers - WPA Pool/Getty Images) ( 167539768 )

Catherine, Duchess of Cambridge arrives at the Inauguration Of Warner Bros. Studios Leavesden on April 26, 2013 in London, England. (Photo by Paul Rogers - WPA Pool/Getty Images) ( 167539771 )

Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge pretend to challenge each other with their wands during the Inauguration Of Warner Bros. Studios Leavesden on April 26, 2013 in London, England. (Photo by Paul Rogers - WPA Pool/Getty Images) ( 167539898 )

Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge pretend to challenge each other with their wands during the Inauguration Of Warner Bros. Studios Leavesden on April 26, 2013 in London, England. (Photo by Paul Rogers - WPA Pool/Getty Images) ( 167539919 )

Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge pretend to challenge each other with their wands during the Inauguration Of Warner Bros. Studios Leavesden on April 26, 2013 in London, England. (Photo by Paul Rogers - WPA Pool/Getty Images) ( 167578791 )

Kate the Duchess of Cambridge, her husband Prince William and his brother Prince Harry, both not pictured, leave after attending the inauguration of "Warner Bros. Studios Leavesden" near Watford, approximately 18 miles north west of central London, Friday, April 26, 2013.(AP Photo/Matt Dunham) ( Britain Royal Warner Bros. )

Britain's Kate the Duchess of Cambridge stands with her husband Prince William, left, and his brother Prince Harry, right, as they are greeted upon their arrival to attend the inauguration of "Warner Bros. Studios Leavesden" near Watford, approximately 18 miles north west of central London, Friday, April 26, 2013. (AP Photo/Matt Dunham) ( Britain Royal Warner Bros. )

Kate the Duchess of Cambridge, her husband Prince William and his brother Prince Harry, both not pictured, leave after attending the inauguration of "Warner Bros. Studios Leavesden" near Watford, approximately 18 miles north west of central London, Friday, April 26, 2013. (AP Photo/Matt Dunham) ( Britain Royal Warner Bros. )

Britain's Kate the Duchess of Cambridge talks to British author J. K. Rowling, left, as she and her husband Prince William and his brother Prince Harry, not pictured, attend the inauguration of "Warner Bros. Studios Leavesden" near Watford, approximately 18 miles north west of central London, Friday, April 26, 2013. (AP Photo/Chris Jackson, Pool) ( Britain Royal Warner Bros. )

Britain's Kate the Duchess of Cambridge looks at the costume for the character Hagrid in the Harry Potter films as she and her husband Prince William and his brother Prince Harry, not pictured, attend the inauguration of "Warner Bros. Studios Leavesden" near Watford, approximately 18 miles north west of central London, Friday, April 26, 2013. (AP Photo/Chris Jackson, Pool) ( Britain Royal Warner Bros. )

Britain's Prince William, right, and his brother Prince Harry look at a 'Batsuit' used in the Batman films as they and Kate the Duchess of Cambridge, not pictured, attend the inauguration of "Warner Bros. Studios Leavesden" near Watford, approximately 18 miles north west of central London, Friday, April 26, 2013. (AP Photo/Chris Jackson, Pool) ( Britain Royal Warner Bros. )