First Lady Michelle Obama greets Mrs. Margarita Zavala de Calderon, the First Lady of Mexico, in the Yellow Oval Room of the White House, Feb. 25, 2010. (Official White House Photo by Samantha Appleton)
U.S. first lady Michelle Obama walks into the East Room of the White House to meet with music students to view a special preview performance for the White House's annual Governor's Dinner in Washington February 21, 2010.
U.S. first lady Michelle Obama speaks at the National Governors Association winter meeting about important role of governors as leaders in combating childhood obesity and achieving the goals of the Lets Move initiative in Washington February 20, 2010.
First lady Michelle Obama tours a Fresh Grocer store in Philadelphia, Friday, Feb. 19, 2010. Mrs. Obama's visit to the store was to highlight Philadelphia's efforts to get healthy, affordable food to its communities.
First lady Michelle Obama meets with schoolchildren from the London borough of Islington who won an Islington Black History essay competition, at the White House in Washington, February 18, 2010.