Justin Bieber's bodyguards are under investigation AGAIN for allegedly roughing up someone who was trying to take his picture. Law enforcement sources tell Bieber and co. were at a hookah lounge in Hollywood when someone tried to snap a pic of the Biebs. Bieber's bodyguards tried to stop the person from taking pics and some sort of scuffle ensued.

We're told cops have opened a misdemeanor battery investigation. Bieber is not considered a suspect and it's unclear what role (if any) he played in the incident. Bieber and his bodyguards were accused of three similar incidents in Miami just this week alone.