Watch Demi Lovato Sing the SpongeBob SquarePants Theme as Christina Aguilera
, , Demi Lovato  and Demi Lovato as Christina Aguilera  stopped by The Tonight Show on Friday night, where she played "Wheel of Musical Impressions" with Jimmy Fallon. , The "Confident" singer, who took part in the Lionel Richie tribute at last Monday's Grammys, took turns with Fallon singing children's songs as various randomly selected singers. , Fallon gamely sang as Louis Armstrong and Dave Matthews, but Lovato's impressions were the segment highlights. First, she did Cher, then "Twinkle Twinkle Little Star" as Fetty Wap, before breaking out Aguilera-style vocal runs for the SpongeBob SquarePants theme song.