TMZ was in an L.A. County Courthouse this morning as Scott Weiland's attorney told us the troubled rocker has just finished a stint in rehab.

Weiland's attorney, Tony Brooklier, says the former STP-er has completed 28 days in a treatment facility and is "doing well."

Weiland was arrested last November and booked for driving under the influence of a drug.

His next court date is Wednesday the 5th.