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 .

Demi Lovato made a surprise appearance at the Jonas Brothers' 20th anniversary tour opener at MetLife Stadium, reuniting on stage with Joe Jonas for a nostalgic Camp Rock duet. The pair performed fan favourites,

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.