Bad week for "American Idol" contestants ... law enforcement sources tell TMZ seventh season competitor Asia'h Epperson is currently in custody and has been booked after beating up a girl at a Hollywood nightclub.
According to sources, Epperson and another chick -- her sister -- kicked another clubgoer's butt inside Colony club.
We have video of Asia'h leaving the club with Too Short at 2:20 AM, just before she was cuffed and cheerfully taken away.
The victim complained of bruising and pain. Epperson is currently at the station.
UPDATE: The alleged victim has now made a citizen's arrest and says she will press charges. Asia'h will be transferred to a nearby jail soon.
UPDATE 7:20 AM: Asia'h has just been released from custody.
Story developing ....