chris brown & his mother

Chris Brown and his mother, Joyce Hawkins

*As we already reported, Chris Brown had his day in court earlier today to deal with being kicked out of rehab. Well, he’s been sent right back to spend 90 days in rehab to deal with his anger issues.

OK, but what did he do while he in rehab originally (after the Washington, DC alleged fight incident) that caused him to get kicked out?

According to TMZ, Brown was told to get to steppin’ because he threw a rock through his mother’s  car window.

We just got hold of the probation report in the Rihanna case, which outlines what happened during his 13 days in a Malibu rehab joint for anger management counseling.

According to the report, Chris’ mom showed up for a family session and was urging her son to stay in the facility for extended treatment.  Apparently, Chris violently disagreed with her and in a fit of anger threw a rock through her car window, shattering it.

The report goes on to say without continued therapy and a strong recovery support network, Probation says his prognosis is “very guarded.”

And here’s an interesting detail from the report: before Chris entered rehab on October 29th, he says he had issues with Attention Deficit Disorder and also underwent a period of depression.

TMZ broke the story … Chris got booted from the Malibu facility earlier this month following the outburst … after just two weeks of treatment.

As we reported, the judge has just ordered Brown to 90 days in a facility and also ordered him to submit to drug testing. He’s also not allowed to leave the state except to go to DC on Monday for hearing in his ongoing case there.