Justin Theroux unintentionally crashed a birthday party Friday night. The actor was spotted at a corner table during a private birthday party at the rooftop of the Jane Hotel. Spies said he was with two male friends who had brought two girls, but his fiancée, Jennifer Aniston, was not in sight. “He seemed to be reserved and low-key,” says a spy. We’re told someone had booked the space for their birthday, but staff let Theroux and his group in anyway.