The Jonas Brothers were hard at work yesterday with a full on entourage! Kevin Jonas, Joe Jonas, Nick Jonas and their much-young brother Frankie Jonas filmed a new music video at a theater yesterday in Los Angeles, California. These poor kids, when do they ever get a day off? Nick Jonas did celebrate his birthday yesterday, but we didn’t see any birthday cake on set for him! Maybe a car would be a better present – Nick turned 16 yesterday.