The Jonas Brothers surprised fans at their New Jersey concert by bringing out Demi Lovato, their co-star from the 2008 Disney movie "Camp Rock." Joe Jonas and Demi performed popular songs from the movie, including "Wouldn't Change a Thing" and "This is Me," marking their first live performance of the latter in a decade. The reunion was a nostalgic moment for fans, as the duo had not performed together in years. The concert also featured guest appearances by Jesse McCartney and the band's former bodyguard Big Rob, kicking off the Jonas Brothers' 20th-anniversary show with a memorable performance.