Bobby Brown -- ARRESTED for DUI

2:52 PM PST -- Law enforcement sources tell us ... cops believe Brown was DRUNK at the time of his arrest.

Brown was booked for driving under the influence and for driving with the blood alcohol content of .08 or higher.

Bobby Brown has just been arrested on suspicion of driving under the influence in Los Angeles ... TMZ has learned.

Law enforcement sources tell TMZ, Bobby was pulled over in Reseda, CA at 12:20 PM PST for allegedly driving while talking on a cell phone.

We're told 43-year-old Bobby is currently in custody in Van Nuys jail. It's unclear what substance cops believe Brown had been using before he got behind the wheel.

Whitney Houston's ex-husband already has a DUI conviction on his record stemming from an arrest in Georgia in 1996. He eventually pled guilty to DUI and served 8 days in jail.

Brown has been back in the news ever since Whitney died in a Beverly Hills hotel room on February 11. Bobby was turned away from the death scene and left the funeral service early after a disagreement with Houston's family.

2:38 PM PST -- Sources tell us ... Bobby has already bailed out of jail.

1:54 PM PST -- Sources close to the singer tell us ... Bobby's "people" are en route to the jail to bail him out.