Demi Lovato was a guest on The Tonight Show with Jimmy Fallon Friday (Feb. 19). She joined Jimmy Fallon in the popular game of “Wheel of Musical Impressions” where each player must sing a random song in an impression of another singer. Fallon had Louis Armstrong and Dave Matthews while Demi Lovato had Fetty Wap, Cher, and Christina Aguilera. Watch the hilarious video!