LOS ANGELES (Reuters) - R&B singer Chris Brown, on probation for beating his former girlfriend, was charged on Tuesday with a hit-and-run and driving without a valid license in connection with a May 21 traffic accident in Los Angeles. Brown, 24, allegedly rear-ended another car and faces up to six months in jail on each misdemeanor charge, L.A. City Attorney spokesman Frank Mateljan said. He will be arraigned in Los Angeles Superior Court on July 15, Mateljan said. ...