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' 20th anniversary tour opened with a wave of nostalgia on Sunday night at MetLife Stadium when Demi Lovato joined Joe Jonas on stage for a surprise Camp Rock reunion. Fans erupted as Joe began singing the 2008 Disney Channel classic 'Gotta Find You',