Orange County Sheriff's Department is investigating claims that Dennis Rodman assaulted a female reveler at a California bar.

The incident allegedly took place at Hennessy's Tavern in Dana Point, near Laguna Beach.

An eyewitness says that the ex-basketball star allegedly slapped the woman's rear end so hard that it left a "major mark."

Jim Amormino, a spokesperson for the O.C. Sheriff, told TMZ: "Officers did respond to an incident involving a man and a woman.

A police report was taken, and is currently with the sex crime unit of the Sheriff's department."