First lady Michelle Obama welcomes community leaders from across the country to celebrate the successes and share best practices to continue the work of the Mayor's Challenge to End Veterans' Homelessness in the East Room of the White House complex in Washington, D.C., on Nov. 14. Manuel Balce Ceneta/AP hide caption

Michelle Obama delivers her final remarks as first lady during a Jan. 6 ceremony at the White House honoring the 2017 School Counselor of the Year. Chip Somodevilla/Getty Images hide caption

First lady Nancy Reagan sits on the knee of Mr. T, dressed as Santa Claus, and gives him a peck on the head, as he joined her for a preview of the White House Christmas decor in 1983. Ira Schwarz/AP hide caption

This year's White House Gingerbread House is made with 150 pounds of gingerbread, 100 pounds of bread dough, 20 pounds of gum paste, 20 pounds of icing and 20 pounds of sculpted sugar pieces. It also features both the East and West Wings. Raquel Zaldivar/NPR hide caption

Tika Sumpter and Parker Sawyers in Southside With You. Pat Scola/Courtesy of Miramax and Roadside Attractions hide caption

A drawing of the first White House designed by architect James Hoban, who won the competition to design the president's new house in 1792. Building began that year and ended in 1800. AP hide caption

First lady Michelle Obama acknowledges the crowd before delivering her speech during the Democratic National Convention in Philadelphia on Monday. Joe Raedle/Getty Images hide caption

First lady Michelle Obama delivers her speech on the first evening of the Democratic National Convention in Philadelphia. Saul Loeb/AFP/Getty Images hide caption

Reince Priebus, chairman of the Republican National Committee, speaks to the delegates on start of the first day of the Republican National Convention. An estimated 50,000 people are expected in Cleveland, including hundreds of protesters and members of the media. Alex Wong/Getty Images hide caption

Evelyn Sokpo (from left), 12; Sankay Diallo, 13; and Rita Swen, 13. Clair MacDougall for NPR hide caption

First Lady Michelle Obama wears her signature cardigan while dancing with performers from the television show So You Can Dance during the annual White House Easter Egg Roll on April 6, 2015. Mark Wilson/Getty Images hide caption

Nancy Reagan's casket arrives at the funeral service at the Ronald Reagan Presidential Library in Simi Valley, Calif., on Friday. Jae C. Hong/AP hide caption

President Obama and first lady Michelle Obama, shown here in September, will deliver keynote addresses at the SXSW Interactive and Music festivals, respectively. Mandel Ngan/AFP/Getty Images hide caption

Keepers had an opportunity to weigh the 4.5 week-old giant panda cub on Sept. 21. Smithsonian's National Zoo hide caption

First lady Michelle Obama shares encouraging words at Girl Up Leadership Summit. Molly Riley/AP hide caption