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In this image released by Annie Leibovitz / Vogue, the March 2009 cover of Vogue is seen featuring first lady Michelle Obama. (AP Photo/Annie Leibovitz / Vogue)

First lady Michelle Obama looks at the inaugural gown she wore to the inaugural balls and is now on display at the Smithsonian Museum of American History on March 9, 2010 in Washington, DC. Mrs. Obama continues a long tradition of first ladyís who have donated their inaugural gown to be on display at the Smithsonian. (Photo by Mark Wilson/Getty Images)

President Barack Obama and first lady Michelle Obama walk away after visiting the crash site of Flight 93 during their visit to the Flight 93 National Memorial Sunday, Sept., 11, 2011, in Shanksville, Pa., on the 10th anniversary of Sept. 11. (AP Photo/Pablo Martinez Monsivais)

First lady Michelle Obama arrives in Downing Street on April 1, 2009 in London. Obama is on his first trip to the UK as President and will be attending G20 world leaders' summit dedicated to tackling the global financial crisis. (Photo by Dan Kitwood/Getty Images)

**FILE** This February 2009 file photo released by The White House on Feb. 27, 2009, shows the official portrait of first lady Michelle Obama taken in the Blue Room of The White House in Washington. (AP Photo/The White House, Joyce N. Boghosian, File)

First lady Michelle Obama arrives in the Rose Garden of the White House before President Barack Obama honors the 2009 National Teacher of the Year Anthony Mullen of Greenwich, Conn., Tuesday, April 28, 2009, in Washington. (AP Photo/Charles Dharapak)

President Barack Obama and first lady Michelle Obama walk in the Inaugural Parade on January 20, 2009 in Washington, DC. Obama was sworn in as the 44th President of the United States, becoming the first African-American to be elected President of the US. (Photo by Ron Sachs-Pool/Getty Images)

This March 3, 2009 file photo shows first lady Michelle Obama reacts as Retired Gen. Wilma L. Vaught, not shown, speaks at Arlington National Cemetery's Women in Military Service for America Memorial Center in Arlington, Va..(AP Photo/Alex Brandon,File)

This March 20, 2009 file photo shows first lady Michelle Obama arriving to take part in the groundbreaking of the White House Kitchen Garden on the South Lawn of the White House in Washington, with students from Washington's Bancroft Elementary School. (AP Photo/Ron Edmonds,File)

This March 5, 2009 file photo shows first lady Michelle Obama waits to be introduced after handing out meals during her visit to Miriam's Kitchen in Washington. (AP Photo/Pablo Martinez Monsivais,File)

President Barack Obama accepted his party's nomination to be the 2012 Democratic Presidential candidate tonight September 6th, 2012. His wife Michelle and daughters Malia and Sasha at the Democratic National Convention in Charlotte, North Carolina. Helen H. Richardson, The Denver Post

US President-elect Barack Obama and his wife Michelle arrive at the 'We Are One" concert, one of the events of Obama's inauguration celebrations, at the Lincoln Memorial in Washington on January 18, 2009. A galaxy of stars including Bruce Springsteen, U2 and Stevie Wonder will usher Obama into the White House, with a half-million people expected to brave the cold to celebrate the first African-American president. AFP PHOTO/Jewel SAMAD

This Feb. 25, 2009 file photo shows first lady Michelle Obama hosting 'Stevie Wonder In Performance at the White House: The Library of Congress Gershwin Prize' in the East Room of the White House in Washington. (AP Photo/Gerald Herbert,File)

Michelle Obama, wife of Democratic presidential candidate U.S. Sen. Barack Obama (D-IL), walks on stage during the first of three presidential debates before the 2008 election September 26, 2008 in the Gertrude Castellow Ford Center at the University of Mississippi in Oxford, Mississippi. Both candidates arrived in Oxford after taking part in negotiations the previous day in Washington, D.C. to solve the current financial crisis. (Photo by David McNew/Getty Images)

This April 3, 2009 file photo shows President Barack Obama, and first lady Michelle Obama, left, disembark from a helicopter at the Klosterwiese in Baden-Baden, Germany. (AP Photo/Christof Stache,File)

US President Barack Obama and First Lady Michelle Obama join hands April 05, 2009 as they walk away from the stage following an address at Hradcany Square in Prague. Barack Obama pledged Sunday to lead the quest for a world without nuclear weapons, denouncing "fatalism" over proliferation and calling for North Korea to be punished for its rocket launch. AFP PHOTO/Mandel NGAN

First Lady Michelle Obama, right, and Samantha Cameron, wife of David Cameron, smile during an official state arrival ceremony on the South Lawn of the White House in Washington, D.C., U.S., on Wednesday, March 14, 2012. Obama welcomed Cameron to the White House to start off an official visit combining ceremony with discussions on such critical issues as Afghanistan and the global economy. Photographer: Chip Somodevilla/Pool via Bloomberg

President Barack Obama and first lady Michelle Obama walk across the tarmac to board Air Force One at Honolulu Joint Base Pearl Harbor-Hickam, Saturday, Jan. 5, 2013, in Honolulu, en route to Washington after their holiday vacation. (AP Photo/Carolyn Kaster)

Michelle Obama listens to her husband, Preisdent Barack Obama, speak at the Obama Homes States Ball, one of ten official inaugural balls January 20, 2009 in Washington DC. Obama was sworn in as the 44th President of the United States today, becoming the first African-American to be elected to the presidency. (Photo by Mark Wilson/Getty Images)

First lady Michelle Obama visits a Walgreens store that sells produce on October 25, 2011 in Chicago, Illinois. The visit was part of the first lady's "Let's Move!" initiative, which is designed to promote healthy eating and lifestyles in low-income areas. While visiting the city the first lady also took a tour of an urban farm. (Photo by Scott Olson/Getty Images)

First lady Michelle Obama walks with daughter Sasha from Marine One to the White House on January 6, 2013 in Washington, DC. U.S. President Barack Obama is expected to dominate Chuck Hagel, a Republican and former U.S. senator from Nebraska, to succeed Defense Secretary Leon Panetta. (Photo by Dennis Brack-Pool/Getty Images)

US First Lady Michelle Obama (R) and Los Angeles Mayor Antonio Villaraigosa speak in Inglewood, California on February 1, 2012, where she arrived to help showcase tangible changes being made by Northgate Gonzales Markets that will use FreshWorks financing to further prioritize healthy food retailing as they expand,create jobs, and nourish communities that otherwise lacked access to fresh affordable food. AFP PHOTO / Frederic J. BROWN

Television host Jimmy Kimmel (L) alongside First Lady Michelle Obama (R) during the White House Correspondents Association Dinner in Washington, DC, April 28, 2012. The annual event, which brings together Hollywood celebrities, news media personalities and Washington correspondents, features comedian Jimmy Kimmel as the host. AFP PHOTO / Saul LOEBSAUL LOEB/AFP/GettyImages

Michelle Obama waves good bye to the delegates after giving her highly anticipated speech for the evening at he Democratic National Convention tonight September 4th, 2012 in Charlotte, North Carolina. Also featured at tonight's convention held in the Time Warner Cable Arena was Julian Castro, San Antonio mayor and the democratic party's first latino keynote speaker. Helen H. Richardson, The Denver Post

Michelle Obama shakes hands with fans after her speech. First Lady Michelle Obama was in Colorado for a second day today October 11, 2012 to speak to grassroots supporters in Castle Rock. She spoke about what is at stake in this election for Coloradoans and encourage them to help organize their communities between now and election day. She spoke at the Douglas County Fairgrounds in Castle Rock. Yesterday she visited Fountain and Durango. Helen H. Richardson, The Denver Post

First Lady Michelle Obama shook hands with Dr. James Denton Saturday during a visit to the Medical Center of Aurora. Obama talked with doctors, nurses and other hospital staff members during a visit to the hospital Saturday afternoon, August 11, 2012. Dr. Denton was one of several surgeons who responded to the dozens of victims brought to the hospital following the Aurora theater shooting in July. Karl Gehring/The Denver Post

First Lady of the United States, Michelle Obama, on a grassroots campaign stop at Arapahoe High School Wednesday morning, June 20th, 2012, to help re-elect her husband, President of the United States, Barack Obama. Andy Cross, The Denver Post

In this Feb. 9, 2009 file photo, first Lady Michelle Obama models a handmade shawl she received from Director of Public Affairs for the Bureau of Indian Affairs Nedra Darling during an event at the Interior Department in Washington. (AP Photo/Lawrence Jackson, File)

President Barack Obama looks as first lady Michelle Obama straightens out her gown during their dance at the Western Inaugural Ball in Washington, Tuesday, Jan. 20, 2009. (AP Photo/Lawrence Jackson)

US First Lady Michelle Obama speaks next to her 2009 inaugural gown during a ceremony at the Smithsonianís National Museum of American History in Washington, DC, on March 9, 2010. Continuing the long tradition of First Ladies donating their inaugural gowns to the Smithsonian, Michelle presented her 2009 inaugural gown to the Smithsonianís National Museum of American History. AFP PHOTO/Jewel SAMAD

US First Lady Michelle Obama claps as she speaks before an evening of music, poetry and the spoken word in the East Room of the White House in Washington on May 12, 2009. AFP PHOTO/Nicholas KAMM