"We’ve been through so much together," the singer said of her fellow Disney Channel alums. "It was really, really great to spend time with them."

Lovato and the Jonas brothers performed renditions of “This is Me” and “Wouldn’t Change a Thing”, both of which featured in the 2008 Disney Channel film Camp Rock, which saw Joe and Lovato – who had a real-life, albeit short-lived, romance in 2010 – play love interests on screen.

Nick Jonas asked Joe to read the last entry in the Notes appon his phone, and both he and brother Kevin were shocked when Joe whipped out his phone and replied, "Read Camp Rock 3 ." Nick's shocked face caused laughter from the crew, and Joe added, "It's pretty good."