It's a warm summer night. You’ve managed to score a coveted ticket to the Jonas Brothers concert, where you’re singing at the top of your lungs about scorching temperatures, outselling Kelly Clarkson ...

Demi Lovato’s surprise Camp Rock reunion with the Jonas Brothers turned into a healing, full-circle moment that blended ...

From Jesse McCartney to Demi Lovato, here's who the Jonas Brothers have surprised fans with on their Jonas20 Tour, so far.