Rihanna arrived at a Los Angeles courthouse but was saved from coming face to face with her ex-boyfriend Chris Brown - after he copped a plea over charges of assaulting and threatening the Umbrella singer. The star looked upset as he entered the courtroom with his lawyer Mark Geragos. Rihanna arrived a short time later, wearing all black and sunglasses, ready to take the stand to testify against her ex. She was kept a 'family room' adjacent to the court but as it was announced Brown had struck a plea bargain with prosecutors, it became clear Rihanna would not have to take the stand. Brown's p