Teairra Mari — the hot chick who appeared with Bow Wow in the 2010 movie “Lottery Ticket” –* is accused of doing the ONE thing you should never do after getting arrested for DUI … attacking a cop. Law enforcement sources tell us the 23-year-old actress/singer was driving a silver Infiniti through Beverly Hills around 3:00 AM, when she rear-ended the car in front of her. Police at the accident scene observed “signs of intoxication” from Teairra — and arrested her for DUI. One person who was at the scene tells TMZ Teairra was “really messed up … she couldn’t even stand.” And it gets worse … we’re told Teairra didn’t play nice while she was being booked and became “combative” with one of the arresting officers. Sources tell us one cop suffered a “minor cut” to his hand during the incident. As a result, Mari now faces multiple charges — including DUI and assault on a police officer. According to law enforcement, Mari is still in custody and bail has been set at $50k.