Jonas Brothers Burnin' Up over Internet Rumors

The Jonas Brothers hit the stage at F'N MTV to promote their latest single, "Burnin' Up," and we were backstage with the boys as they got heated over rumors about who they're dating!

Nick, Joe and Kevin also told us all about their upcoming performance at the Video Music Awards, their new CD, "A Little Bit Longer," and the big cameos in their latest music video!