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First Lady Michelle Obama and Ellen DeGeneres dance during a taping of 'The Ellen DeGeneres Show' marking the second anniversary of the Let's Move! initiative, in Burbank, Calif., Feb. 1, 2012. (Official White House Photo by Chuck Kennedy) This official White House photograph is being made available only for publication by news organizations and/or for personal use printing by the subject(s) of the photograph. The photograph may not be manipulated in any way and may not be used in commercial or political materials, advertisements, emails, products, promotions that in any way suggests approval or endorsement of the President, the First Family, or the White House. (Photo by Chuck Kennedy/White House/Handout/The White House/Corbis via Getty Images)

First Lady Michelle Obama and Ellen DeGeneres dance during a taping of 'The Ellen DeGeneres Show' marking the second anniversary of the Let's Move! initiative, in Burbank, Calif., Feb. 1, 2012. (Official White House Photo by Chuck Kennedy) This official White House photograph is being made available only for publication by news organizations and/or for personal use printing by the subject(s) of the photograph. The photograph may not be manipulated in any way and may not be used in commercial or political materials, advertisements, emails, products, promotions that in any way suggests approval or endorsement of the President, the First Family, or the White House. (Photo by Chuck Kennedy/White House/Handout/The White House/Corbis via Getty Images)