Jimmy Fallon’s “Wheel of Impressions” is a no-chance-in-hell that this wasn’t planned AND rehearsed game. Christina Aguilera comes up regularly (unless Xtina is playing) but DAMN if Demi Lovato doesn’t nail it. Hot off her star turn as part of the Lionel Richie tribute at the Grammys, Lovato stopped by The Tonight Show (“Oh, hey look. It’s Demi Lovato!”) to try her hand. Just skip to 3:30 to get to it, though you’ll miss Lovato’s spot-on Fetty Wap. Watch.