Demi Lovato [1] performed in front of quite the special audience when she took the stage at the White House on Wednesday. With President Barack Obama and First Lady Michelle Obama [2] sitting in the front row, Demi sang "You Don't Know Me" as part of the Smithsonian Salutes Ray Charles event. Throughout the night, other performers included Usher [3], Jussie Smollett, Leon Bridges, and Anthony Hamilton. At one point, Demi teamed up with Alabama Shakes' Brittany Howard, Andra Day, and Yolanda Adams for "Heaven Help Us All," which brought the crowd to their feet. Check out all the performances above (Demi's starts at 1:42:50), then relive Demi's memorable Grammys performance [4].