The Jonas Brothers opened the Jonas20 tour with Joe Jonas reuniting with Demi Lovato for the first "Camp Rock" performances ...

Demi Lovato wasn't the only Jonas Brothers' guest star Sunday: Members of Switchfoot, Dean Lewis, Jesse McCartney and Marshmello also performed.

Demi Lovato and Jonas Brothers, ie, Nick, Joe, and Kevin, started off their showbiz career early in Disney. The nostalgia was felt by everyone after they all reunited for the opening night of their ...