LOS ANGELES — A judge ordered Chris Brown on Wednesday to spend three months in rehab after reading a report that said a facility discharged the R&B singer because he threw a rock through his mother’s car window.

Superior Court Judge James Brandlin also added more rules for Brown in the coming months, requiring him to perform at least 24 hours of community labor a week and to submit to drug testing as he deals with anger management issues.

Brown and his attorney agreed to the terms, which were suggested by probation officials who are overseeing Brown’s sentence for his 2009 beating of then-girlfriend Rihanna.

The Grammy winner threw a rock through his mother’s car window Nov. 10 after a joint counseling session in which she suggested the singer remain in treatment, according to a letter submitted by the rehab facility.

“Mr. Brown proceeded to walk outside and pick up a rock and threw it through his mother’s car window and it shattered,” the letter says.

Brown was discharged because he had signed a contract agreeing to refrain from violence while in treatment.

The singer voluntarily checked into rehab for anger management treatment Oct. 29, just days after he was arrested in Washington, D.C., after a man accused Brown of punching him after he tried to get into a photo with the singer.