The blushing fan got down on one knee and presented the 'Sonny With a Chance' star with a faux-engagement ring. She happily "accepted" the ring.
"Yes," Lovato joked, "put it on me! Right there. We are doing this!"
Afterward, he presented her with a jar of multicolored jellybeans, and the pair took several photos together, as Lovato flashed her new bling.
Lovato later announced her "engagement" on her Twitter. "You guys...I'm engaged," she tweeted.
Watch the proposal video. >>