The Jonas Brothers already had fans feeling nostalgic with their new tour and then they raised those stakes with their first show.

Demi Lovato surprises fans by joining the Jonas Brothers at the Jonas20 anniversary tour opener for a “Camp Rock” reunion.

Lovato joined Joe Jonas onstage at MetLife Stadium in East Rutherford, New Jersey, where the pair sang two songs — “This Is Me” and “Wouldn’t Change a Thing” — from their Disney Channel hit movies “Camp Rock” and “Camp Rock 2: The Final Jam,” according to videos posted to social media.