Robert Pattinson may turn 27 today, but that doesn't mean that he can't celebrate his big birthday ahead of the actual date. He kept a low profile as he left the Chateau Marmont with a pal on Thursday. Kristen Stewart wasn't spotted leaving the club with Rob, but that doesn't mean that she won't be around to celebrate his big day with him today. The couple are back in LA after they both took a trip out to NYC so Kristen could attend the 2013 Met Gala. Rob and Kristen left NYC together and even picked up a slice of pizza before they jetted out of the Big Apple on Wednesday. For more Rob birthday fun, be sure to check out our list of interesting facts about Robert Pattinson!