Demi Lovato & Joe Jonas Share ‘Camp Rock’ Reunion at Jonas Brothers Concert

The Jonas Brothers left Disney fans stunned at their New Jersey concert … bringing out a surprise guest that had everyone feeling nostalgic.

It all went down Sunday night at MetLife Stadium … where the JoBros were reflecting over their 2008 smash hit Disney movie, “Camp Rock.” Joe Jonas — the film’s lead — broke out into song, singing “Gotta Find You,” sending fans into a frenzy.

But then … he brought out Demi Lovato onstage — who played his onscreen love interest — and the whole crowd went wild.

The duo then belted out some of the most popular songs from the movie, like “Wouldn’t Change a Thing” and “This is Me.”

It was a long time coming for this reunion … after “This is Me,” Demi and Joe told the crowd they hadn’t performed the song live in roughly a decade.

What makes this all the more interesting … Demi and Joe had briefly dated in 2010 — but continued a solid friendship following their split.

In addition to Demi, the brother band also brought out JesseMcCartney to perform his hit song “Beautiful Soul,” among others — and their former bodyguard Big Rob for “Burnin’ Up.”