Chris Brown -- In Jail for the Long Haul

Chris Brown will probably spend the next month behind bars, and possibly a lot longer.

TMZ broke the story ... Chris was arrested and jailed Friday after getting thrown out of the Malibu rehab facility where he's been living for nearly 4 months, per judge's order. The judge in the Rihanna case ordered Chris to stay at the rehab joint until April 28, when his D.C. assault case goes to trial. But Chris broke the rules, was booted, and Sheriff's deputies hauled him to jail.

Brown's lawyer, Mark Geragos, will appear in court Monday, trying to convince the judge to cut Brown a break and let him either go to another rehab facility or go on house arrest pending the D.C. trial. That will be an uphill battle, given that this is the second rehab facility that booted Brown.

The D.C. trial is set for April 17. Geragos has a pretty strong defense -- there are problems with the prosecution's case. But if Chris is found guilty, he could end up in PRISON for breaking the law while on probation in the Rihanna case.