R. Kelly assistant says he made her write false confession

R. Kelly's longtime assistant testified Monday that the R&B superstar was so paranoid, he once asked her to change into a robe to demonstrate she was not wearing a wire.

"He could get pretty heated," said Diana Copeland, who was Kelly's assistant for 15 years. She told jurors he made her cry at times. Copeland testified that Kelly kept strict policies for his entourage and once compelled her to write a letter falsely confessing to stealing from him. Still, Copeland said she did not witness any of the alleged abuse -- including kidnapping and sexual assault -- described by a long list of witnesses over the past month in Kelly's racketeering trial at a federal court in Brooklyn. The Grammy-winning, multiplatinum-selling singer has denied accusations that he led a criminal enterprise that sexually exploited women, girls and even boys during a 30-year career highlighted by his anthem "I Believe I Can Fly." His lawyers have portrayed his accusers as groupies who are lying about their relationships with him.