R&B singer Teairra Mari was arrested Friday on charges of DUI and assault of a police officer following an incident in which she rear-ended another car.  Mari was reportedly driving in Beverly Hills around 3AM when she was in an accident.  Police observed signs that the 23 year-old singer was intoxicated, and took her into custody for DUI.  Police claim the singer was "combative", and an officer ended up sustaining a "minor cut" on his hand.  Mari was held until Friday afternoon, when she was released on $50,000 bail.