The Jonas Brothers keep close together as the arrive at NYC’s Ed Sullivan Theatre before their appearance on The Late Show with David Letterman on Thursday afternoon (June 11).

The musical trio — Nick, Kevin and Joe — will be performing a FREE concert later tonight at Irving Plaza. The first 700 fans will get tickets.

Better hurry thought, the JoBros just tweeted, saying, “We just heard there’s already over 500 people outside of Irving Plaza and we just announced it a couple hours ago. So awesome! There’s still tickets available so make sure to head down to Irving Plaza! We’ll be playing some new music! It’s gonna be so much fun! -JB.”

10+ pics inside of Jonas Brothers…