The pair sang "This Is Me" and "Wouldn't Change a Thing," 17 years after the Disney Channel original movie was released.

The band — consisting of brothers Joe, Nick and Kevin Jonas — kicked off their 20th anniversary tour on Sunday at MetLife Stadium in their home state of New Jersey. But to make it more special, they surprised their fans with some special guests throughout the show, including Demi Lovato .

The Jonas Brothers appeared opposite star Demi Lovato in the 2008 original film and the 2010 sequel “Camp Rock 2: The Final Jam.” The trio played a fictional band called Connect 3. A person with knowledge of the project told TheWrap that nothing has been made official at Disney, despite Jonas’ assertion otherwise.