Lovato commented on Joe's post with, "Love you."

Demi and Joe dated for just a few months in 2010, three years after first meeting while working on the Disney channel's Camp Rock, and although their romantic relationship didn't last, the singer tells us he and the brunette beauty are very close now.

"She's family," Jonas told E! News. "We've known Demi for so many years. We're performed with her, toured with her. She's just incredible. It's not always the case," he continued. "Sometimes you have to know when to fold the cards. I don't think of her as an ex. We're really good friends. We've gone through so much together and we're really close now."

In a recent joint interview with Nick for Billboard magazine, the 23-year-old pop star joked that her time as a Disney star still haunts her to this day.

"We joked around that it was Disney High, except we all were shooting shows and really overworking," she explained. "I joke that I sometimes have PTSD after leaving the channel, because if my schedule starts to get too busy, I rebel and I get bitchy."

But let us not forget that Disney also gave us some extremely memorable moments, like this duet, that we all got to relive last night on stage.