Chris Brown is reported to be under strict supervision for an upcoming charity trip.The 24 year old is said to have been granted special permission to leave rehab for a few hours on Sunday to help collect christmas toys for under priviledged children.He has been warned he will be kicked out of rehab if he misbehaves during the outing.Chris,whose doctors believe the experience will be good for his treatment,only has permission to attend the event from 1pm until 4pm tomorrow,and must return immediately afterwards.He will also under go a drug test when he returns from the event.The charity drive is hosted by his clothing line,Black Pyramid,and skate board company Brooklyn project,both based in Los Angeles.Chris was ordered to rehab by a judge soon after he was kicked out of another centre in Malibu,Califonia because he threw a rock through his mother's car window.His probation steming from a violent assault on his ex girlfriend ,Rihan...