Demi Lovato joined Jimmy Fallon on "Ew!" [1] Monday night, appearing just long enough to make out with an Ed Sheeran pillow and meet Sara's stepdad, Gary. In addition to the skit itself, The Tonight Show posted a time-lapse video of Fallon in the makeup chair as the pros turn him into Sara. It's an impressive transition, and we might need to steal some of those tricks. Take a look and catch up on all the celebrities who have been on "Ew!" [2]