Chris Brown has just entered a rehab facility for anger management issues as he is close to a possible prison sentence. His attorney, Mark Geragos, just dropped him off at a facility in Malibu.

The L.A. County probation department is going full bore in its investigation to determine if Brown violated his probation in the Rihanna case by getting arrested in D.C. over the weekend after allegedly punching a guy in the nose.

Sources say, Brown flew to L.A. after getting released from the D.C. jail and met with L.A. County Probation Department officials today. It’s likely the Probation Department will determine that Brown violated his probation, and a judge could sentence him to as much as 4 years in prison.