Chris Brown will be LOCKED UP until April 23 … he was DENIED in court Monday afternoon in his bid to win release! Chris was arrested after getting kicked out from rehab Friday. The judge had ordered him to stay in rehab while he decided whether Brown violated his probation in the RiRi case. The judge had Chris arrested almost immediately after the rehab facility kicked him out. The judge claimed that Chris had an “inability to stay out of trouble.” Hizzoner was especially worried at a statement Chris made at the rehab place, “I am good at using guns and knives.” So Chris will sit in prison until April 23. The judge wants Chris locked up until a D.C. jury decides if Chris committed criminal assault in an unrelated case. That trial is set for April 17. It’s not sure if the judge will let Chris back to attend the trial. The L.A. judge will hold a probation violation hearing on April 23, and if Chris is convicted in D.C. he’s basically dead! He could possibly be sentenced to 4 years in jail for violating probation in the Rihanna case. One of the conditions — follow the rules! He also violated the rule requiring him to take a random drug test. He basically had a change of heart and came up clean, but the initial refusal was a violation. And Chris talked sh*t about rehab during a group therapy session. Chris was arrested right after he got the boot … staying in rehab was a requirement of the judge pending his trial in D.C. next month for assault.