President Barack Obama talks with Justin Timberlake in the Blue Room of the White House prior to the “In Performance at the White House: Memphis Soul” concert in the East Room, April 9, 2013. At left, First Lady Michelle Obama talks with Queen Latifah and her grandmother, Katherine Viola Bray.

First Lady Michelle Obama and students from around the country participate in the White House Kitchen Garden spring planting on the South Lawn of the White House, April 4, 2013. Mrs. Obama was joined by students from Benjamin David Gullett Elementary School in Bradenton, Fla., Arthur D. Healey School in Somerville, Mass., Sarah Moore Greene Magnet Technology Academy in Knox County, Tenn., the Milton Elementary School in Milton, Vt., and Harriet Tubman and Bancroft Elementary Schools in Washington, D.C. (Official White House Photo by Lawrence Jackson)

President Barack Obama and First Lady Michelle Obama, along with daughters Malia and Sasha, listen as Eddie Floyd sings "Knock On Wood" during the “In Performance at the White House: Memphis Soul” concert in the East Room of the White House, April 9, 2013.

President Barack Obama and First Lady Michelle Obama join musicians on stage during the finale of the “In Performance at the White House: Memphis Soul” concert in the East Room of the White House, April 9, 2013. The program included performances by Alabama Shakes, William Bell, Steve Cropper, Eddie Floyd, Ben Harper, Queen Latifah, Cyndi Lauper, Joshua Ledet, Sam Moore, Charlie Musselwhite, Mavis Staples, Justin Timberlake, and Booker T. Jones.

First Lady Michelle Obama meets with Emine Erdoğan, wife of the Prime Minister of Turkey, in the Yellow Oval Room of the White House, May 16, 2013.

First Lady Michelle Obama meets with Emine Erdoğan, wife of the Prime Minister of Turkey, in the Yellow Oval Room of the White House, May 16, 2013. (Official White House Photo by Lawrence Jackson)

President Barack Obama and First Lady Michelle Obama host a Passover Seder Dinner for family, staff and friends, in the Old Family Dining Room of the White House, March 25, 2013.
(Official White House Photo by Pete Souza)

U.S. Secretary of State John Kerry, First Lady Michelle Obama, and Mrs. Teresa Heinz Kerry pose for a photo with participants from the first Department of State Tweetup at the 2013 International Women of Courage Award Ceremony at the U.S. Department of State in Washington, D.C., on March 8, 2013. [State Department photo/ Public Domain]

President Barack Obama and First Lady Michelle Obama walk with their daughters Sasha and Malia, right, to attend an Easter service at St. John’s Church in Washington, D.C., Sunday, March 31, 2013. (Official White House Photo by Pete Souza)

Bo, the Obama family dog, waits for First Lady Michelle Obama on the South Lawn driveway before departing the White House, March 20, 2013. Bo accompanied Mrs. Obama during her visit to Maryland Fisher House IV at Walter Reed National Military Medical Center in Bethesda, Md. (Official White House Photo by Lawrence Jackson)