Jonas showed up on stage to sing throwback duet “This Is Me” from the “Camp Rock” soundtrack with Lovato, and posted a super cute vid of the pair rehearsing… watch!
“Tonight was amazing. Fun keeping this a secret @ddlovato”
The two briefly dated in 2010. Joe is now rumored to be dating model Gigi Hadid, while Demi has an on-again/off-again relationship with Wilmer Valderrama.