India, Aug. 11 -- The Jonas Brothers kicked off their JONAS20: Greetings From Your Hometown Tour in unforgettable style on Sunday night (August 10), transforming MetLife Stadium into a Disney Channel time machine. In a moment no one saw coming, the trio brought out their former Camp Rock co-star Demi Lovato for a nostalgic, show-stopping collaboration.

After years without a public appearance together, Kevin, Joe, and Nick Jonas welcomed Demi to the stage to deafening cheers. The group launched into a "Gotta Find You" / "This Is Me" mashup from the 2008 Camp Rock film before seamlessly transitioning into "Wouldn't Change a Thing," the heartfelt Joe-Demi duet from Camp Rock 2: The Final Jam.

Seventeen years may have passed since the first...