Nicole Richie and Mischa Barton on a recent shopping trip. Um, when your purses are bigger than you…you’ve got a problem.

Following in the footsteps of her on again, off again friend Paris Hilton, Nicole Richie was arrested early Monday morning on charges of driving under the influence. CHP officers responded at 12:31 A.M. after two 911 callers reported seeing a 2005 black Mercedes SUV going the wrong way on the 134 Highway.

Tags: Nicole Richie