Michelle Obama

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U.S. First Lady Michelle Obama, front left, her daughters Sasha, front right, Malia, right in the back, and Michelle Obama's mother Marian Robinson, left in the back, arrive at Capital International Airport in Beijing, China, Thursday, March 20, 2014. Michelle Obama has arrived in Beijing with her mother and daughters to kick off a seven-day, three-city tour where she will focus on education and cultural exchange. (AP Photo/Alexander F. Yuan, Pool)

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U.S. First Lady Michelle Obama, front left, her daughters Sasha, front right, Malia, right in the back, and Michelle Obama's mother Marian Robinson, left in the back, arrive at Capital International Airport in Beijing, China, Thursday, March 20, 2014. Michelle Obama has arrived in Beijing with her mother and daughters to kick off a seven-day, three-city tour where she will focus on education and cultural exchange. (AP Photo/Alexander F. Yuan, Pool)

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U.S. First Lady Michelle Obama, left, and her daughter Sasha, right, leave their plane as they arrive at Capital International Airport in Beijing, China, Thursday, March 20, 2014. Michelle Obama has arrived in Beijing with her mother and daughters to kick off a seven-day, three-city tour where she will focus on education and cultural exchange. (AP Photo/Alexander F. Yuan, Pool)

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U.S. First Lady Michelle Obama waves as she arrives at Capital International Airport in Beijing, China, Thursday, March 20, 2014. Michelle Obama has arrived in Beijing with her mother and daughters to kick off a seven-day, three-city tour where she will focus on education and cultural exchange. (AP Photo/Alexander F. Yuan, Pool)

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FILE - In this Nov. 4, 2008 file photo, then-President-elect Barack Obama and his wife Michelle Obama, wearing a Narciso Rodriguez dress, acknowledge the crowd after he delivered his victory speech at his election night party at Grant Park in Chicago. Curators at the National Archives have culled their collection in search of some of the great signatures of history. A special exhibit opening Friday includes the personal marks of figures that include Thomas Jefferson, Frank Sinatra, Jackie Robinson, Adolf Hitler and Saddam Hussein, along with important documents from history. For the first time, the black dress worn by Michelle Obama on the night of the 2008 election is going on display. It was designed by Narcisco Rodriguez. (AP Photo/Pablo Martinez Monsivais, File)

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This image provided by NBC shows Jimmy Fallon, left, and first lady Michelle Obama dancing on the set of Late Night with Jimmy Fallon, Friday Feb. 22, 2013 in New York. The dance was part of Obama's “Let’s Move” campaign. (AP Photo/NBC, Lloyd Bishop)

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First lady Michelle Obama speaks at the Building a Healthier Future Summit in Washington, Friday, March 14, 2014. The event brings together leaders from the private, nonprofit, government and academic sectors to address the childhood obesity epidemic. (AP Photo/Susan Walsh)

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First lady Michelle Obama speaks at the Building a Healthier Future Summit in Washington, Friday, March 14, 2014. The event brings together leaders from the private, nonprofit, government and academic sectors to address the childhood obesity epidemic. (AP Photo/Susan Walsh)