Nicole Richie was arrested for DUI

Nicole Richie is a true triple threat in Hollywood - at least on the roads. When the stick-thin socialite earned her first D.U.I. early this morning in Burbank, she was

1) driving the wrong way on the 134 Freeway

2) chatting on her cell phone and

3) riding solo in the carpool lane!

California Highway Patrol says Richie - who was booked at 5' 1" and 85 pounds - admitted to taking Vicodin and smoking pot.

An alcohol screening device, however, indicated she had not been drinking. Richie was booked at 4:50 a.m. and released three hours later.
TMZ