Amanda Bynes was arrested for DUI in West Hollywood early this morning ... TMZ has learned.
Law enforcement sources tell us Bynes was attempting to pass a cop car ... when she sideswiped the vehicle. She was pulled over and cops determined she was not fit to be behind the wheel.
We're told the 26-year-old actress was busted at 3 AM ... she's still behind bars.
According to her booking sheet, Bynes is 5'7" and 125 lbs.
Her bail has been set at $5,000.
Bynes has been frequenting the Hollywood club scene recently.
Just last month, TMZ cameras saw Bynes leaving Greystone Manor and thought she appeared to be extremely intoxicated, she got into the driver's seat of her car and drove off.
TMZ has obtained Amanda Bynes' mug shot ... taken moments after she was arrested for DUI in West Hollywood this morning.
Bynes is still behind bars.