Beverly Hills Police Department is investigating rocker Joel Madden, after a female photographer filed a "crime report" claiming he attacked her during a violent confrontation on Sunday night, reports TMZ
According to police sources, the woman claimed Madden struck her on the left breast "with the heel of his hand" as the rocker tried to escort his girlfriend, Nicole Richie, out of the back door of a restaurant in Beverly Hills.
The photographer told TMZ that she has a welt to prove it, and had to see a doctor for treatment.
Police reps told TMZ that they take every claim seriously, and a crime report was taken on this incident.
A rep for Madden had no comment.
Click Here to see a video where Madden shoves another photographer, moments after the alleged incident.