And how do we know that? Because she was busted by the California Highway Patrol this morning for DUI and that's what it says on the booking sheet. According to gossip magnate TMZ, Nicole was spotted by other drivers going the wrong way on the 134 freeway in Burbank:

The drivers called 911. When the CHP responded, Richie was stopped in the carpool lane and was alone in the vehicle. When cops approached the vehicle, Richie was on her cellphone. Law enforcement officers tell TMZ Nicole Richie admitted she had taken Vicodin and smoked pot. A preliminary alcohol screening device revealed that Nicole was not under the influence of alcohol.

DUI after smoking too much pot? HAHAHAHAHAHAHAHAHAHAHAHAHA That is absolutely hilarious. She parked on the damn freeway! The worst thing I've ever done stoned is eat too much pizza and laugh at unfunny things like Dane Cook. O.K. I killed a drifter once but he was asking for it. Cocky son-of-a-bitch.