India, Aug. 12 -- I t was a Disney Channel throwback like no other at MetLife Stadium, New Jersey, on Sunday night (August 10), as the Jonas Brothers surprised fans by bringing out their Camp Rock co-star and singer Demi Lovato during the opening show of their JONAS20: Greetings From Your Hometown tour. For those who grew up on the 2008 hit, Camp Rock - and its 2010 sequel - the moment was pure nostalgia. The films, which launched the Jonas Brothers and Demi Lovato into global teen stardom, have remained pop-culture touchstones for a generation. This was their first public performance together in years. Kevin, Joe and Nick Jonas welcomed Demi to the stage to deafening cheers before launching into a mashup of Gotta Find You and This Is Me, followed by Wouldn't Change a Thing - the duet originally performed by Joe and Demi in Camp Rock 2: The Final Jam. The reunion spilled backstage, with Joe posting a TikTok of himself and Demi lip-syncing to their duet, sending fans into a frenzy. The crowd, and the tour's livestream audience, also spotted fellow Camp Rock alum Anna Maria Perez de Tagle and the Jonas Brothers' youngest sibling Franklin Jonas, who later joined his brothers onstage for When You Look Me in the Eyes. The surprise has reignited long-standing speculation about Camp Rock 3. Earlier this year, cast members including Matthew 'Mdot' Finley, Perez de Tagle and Roshon Fegan hinted at a possible sequel centred on a contest to discover the next big music act. While Disney has yet to confirm, Joe Jonas has kept fans guessing, saying only, "I can neither confirm nor deny." HTC...