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 .

"We’ve been through so much together," the singer said of her fellow Disney Channel alums. "It was really, really great to spend time with them."

Jonas Brothers recently kicked off their new tour, the ‘Jonas20: Greetings From Your Hometown Tour’, where the trio were reunited with their ‘Camp Rock’ co-star Demi Lovato. The reunion came as a major surprise for fans who could not comprehend that the cast was back together on stage like this.