LOS ANGELES — Chris Brown’s arrest last month on charges of hit-and-run and driving without a valid license may wind up costing the pop singer his freedom, as prosecutors yesterday requested that his probation be revoked.

Brown, who was sentenced to five years’ felony probation in 2009 for beating up then-girlfriend Rihanna, allegedly rear-ended a car in the San Fernando Valley on May 12 and refused to give the other driver his insurance information until two days later.