Bobby Brown was singing at the top of his lungs in a karaoke bar just before his DUI arrest.

The troubled 43-year-old R&B musician was taken into custody for driving under the influence of alcohol at around 1AM in Studio City, California on Wednesday morning.

Bobby was also arrested for a DUI in March in the same area and admitted himself into rehab in August.

The star was crooning at dive bar Maui Sugar Mill Saloon in the San Fernando Valley a few hours before he was booked.

Bobby was undergoing treatment for alcohol addiction as part of a legal arrangement following his arrest for DUI this spring.

"Mr Brown takes his agreement very seriously and admitted himself three weeks after concluding his honeymoon in Mexico during a break from the New Edition tour.

 Bobby is doing well and receiving services that comply with his agreement with the State of California," his attorney Christopher Brown said in a statement previously.

After being processed at the police station, Bobby was released on bond.