Nicole Richie pleaded guilty to driving under the influence of drugs and was sentenced to serve four days in her choice of city or county jail. she was supported by her boyfriend, Good Charlotte rocker Joel Madden.

Richie was arrested on December 11 when she found driving her Mercedes Benz the wrong way down California State Route 134 highway in Burbank, Calif.

She was also fined $2,048 and ordered to complete a 21 day alcohol education course, and to serve three years probation.