Rob Pattinson... Security Guards Are Off Limits!

Oh Rob, what's going on? Is he going from adorable vampire to Justin Bieber?!

Robert Pattinson shoved a security guard after mistaking him for a paparazzo at the end of the singer Bobby Long's show, in West Hollywood, California.

In a video released by TMZ, the actor is surrounded by security guards and paparazzi when he tries to get in the car. And in the midst of the confusion, the actor pushes and punches a security guard. When he realizes the mistake he made, Pattinson lowers his head.

#1 rule: Do not punch anyone. You don't do this Bieber's aggressive behavior. Next time, Robbie, bite a neck!