The Jonas Brothers welcomed Joe Jonas’ ex-girlfriend, Demi Lovato, onstage for a surprise performance at their first concert on their Jonas20: Greetings from Your Hometown tour at New Jersey’s MetLife Stadium on Sunday night.

“JonasCON” is free to ticket holders. Fans can buy tickets for the Hershey show here (prices are as of the time of this publication): New Vivid Seats customers can get $20 off of a $200 order by using the code “PENNLIVE20″ at checkout.

Demi Lovato stole the show at the Jonas Brothers concert in a sage green Acne Studios look featuring a triangle bra top and crystal-adorned pants

While Joe Jonas was unanimously named the “biggest foodie” out of the brothers, Kevin Jonas got the title of “pickiest eater,” despite his objections. As he pointed out, “I just don’t eat fruit, that’s the only thing I don’t eat.”

Priyanka Chopra Jonas expressed her encouragement for her husband, Nick Jonas, along with his siblings during their concert. A touching birthday message she shared for her brother-in-law, Joe Jonas, is gaining widespread attention online.

The Jonas Brothers were "burnin' up' on a County golf course on Wednesday, mingling with fans and trying not to slice their drive too badly.

Jesse McCartney joined the Jonas Brothers at Metlife Stadium in New Jersey on Sunday, Aug. 10. The night was extra special for McCartney because his wife Katie Peterson and 3-month-old son Archer were in the crowd cheering him on.

“Camp Rock,” starring the Jonas Brothers and Demi Lovato, debuted on the Disney Channel in 2008. The music television film centered around Lovato’s character, Mitchie Torres, visiting Camp Rock, a summer music camp. Torres ends up inspiring Joe’s character, Shane Gray, a troubled pop star.