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WASHINGTON, DC - FEBRUARY 12: In this handout provided by the White House, first lady Michelle Obama poses in the Green Room of the White House for her official photograph, made available to news outlets February 20, 2013 in Washington, DC. The portrait was released via the Flickr photo sharing website. (Photo by Chuck Kennedy/The White House via Getty Images)

WASHINGTON, DC - FEBRUARY 12:  In this handout provided by the White House, first lady Michelle Obama poses in the Green Room of the White House for her official photograph, made available to news outlets February 20, 2013 in Washington, DC. The portrait was released via the Flickr photo sharing website.  (Photo by Chuck Kennedy/The White House via Getty Images)

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WASHINGTON, DC - MAY 18: U.S. first lady Michelle Obama delivers remarks during an event in the East Room of the White House May 18, 2015 in Washington, DC. Obama presented the 2015 National Medal for Museum and Library Service, the nation's highest honor given to museums and libraries for service to the community, during the event. (Photo by Win McNamee/Getty Images)

WASHINGTON, DC - MAY 18:  U.S. first lady Michelle Obama delivers remarks during an event in the East Room of the White House May 18, 2015 in Washington, DC. Obama presented the 2015 National Medal for Museum and Library Service, the nation's highest honor given to museums and libraries for service to the community, during the event.  (Photo by Win McNamee/Getty Images)

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JOINT BASE ANDREWS, MD - SEPTEMBER 22: First Lady Michelle Obama with daughters Sasha and Malia arrive to welcome His Holiness Pope Francis on his arrival from Cuba September 22, 2015 at Joint Base Andrews, Maryland. Francis will be visiting Washington, New York City and Philadelphia during his first trip to the United States as pope. (Photo by Olivier Douliery-Pool/Getty Images)

JOINT BASE ANDREWS, MD - SEPTEMBER 22:   First Lady Michelle Obama with daughters Sasha and Malia arrive to welcome His Holiness Pope Francis on his arrival from Cuba September 22, 2015 at Joint Base Andrews, Maryland. Francis will be visiting Washington, New York City and Philadelphia during his first trip to the United States as pope.  (Photo by Olivier Douliery-Pool/Getty Images)

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First Lady Michelle Obama (L) helps a child harvest sweet potatoes from the White House Kitchen Garden during a harvesting event at the White House in Washington, DC, October 6, 2016. / AFP PHOTO / JIM WATSON (Photo credit should read JIM WATSON/AFP/Getty Images)

First Lady Michelle Obama (L) helps a child harvest sweet potatoes from the White House Kitchen Garden during a harvesting event at the White House in Washington, DC, October 6, 2016. / AFP PHOTO / JIM WATSON        (Photo credit should read JIM WATSON/AFP/Getty Images)

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Democratic presidential candidate US Senator Barack Obama, his wife Michelle and daughters Malia (2nd L) and Sacha after a campaign speech at Lawrence North High School in Indianapolis, Indiana, May 03, 2008. AFP PHOTO/Emmanuel Dunand (Photo credit should read EMMANUEL DUNAND/AFP/Getty Images)

Democratic presidential candidate US Senator Barack Obama, his wife Michelle and daughters Malia (2nd L) and Sacha after a campaign speech at Lawrence North High School in Indianapolis, Indiana, May 03, 2008.  AFP PHOTO/Emmanuel Dunand (Photo credit should read EMMANUEL DUNAND/AFP/Getty Images)