WASHINGTON, Nov 6: R&B singer Chris Brown pleaded not guilty on Monday to misdemeanor assault after a fight that broke a man’s nose on Sunday outside a Washington hotel, the latest legal run-in for the Grammy-winner. After spending the night in jail, Brown left the courthouse in a crush of security and press as fans crying “Chris, Chris” tried to rush the artist. He faces a maximum of six months in jail and a 1,000 dollar fine if convicted. (agencies)