TMZ has learned that Nicole Richie was arrested for DUI early Monday morning. She was booked at 4:50 AM today and was released 45 minutes ago. The booking sheet reveals Richie is 5′1″ and 85 lbs.

Law enforcement officers tell TMZ, Nicole Richie admitted she had taken Vicodin and smoked pot.

A rep for Richie could not immediately be reached for comment.

We’re told her SUV was spotted by two motorists 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.

Her booking revealed that she is shockingly only 85 lbs. So much for cleaning up her act. Let’s hope this cry for help makes Nicole really get straight this time.

The Smoking Gun has a copy of Nicole Richie’s DUI booking sheet from this morning and compared it to her booking sheet from February 2003 when she was arrested for heroin possession. Apparently in the three year span between arrests she’s shrunk one inch, lost 5 lbs, and changed from white to black.