The Jonas Brothers brought all the Disney nostalgia to opening night of their 20th anniversary tour - with a little help from Demi Lovato. Nick, Joe and Kevin Jonas kicked off their JONAS20: Greetings from Your Hometown Tour at MetLife Stadium in New Jersey on Sunday, August 10, performing hits spanning their two decades in the spotlight. Along with a surprise appearance from Jesse McCartney, the brothers gave fans an unexpected Camp Rock reunion with Lovato, 32.