Nicole Richie in Rehab

According to People magazine, the star of the television series Simple Life, who is now 6-months pregnant, started an 18-month long treatment program for her problems with alcohol.

The treatment consists of 52 hours of group therapy, daily meetings individually, and 12 hours of sensitization about the effects of alcohol.

Richie, 26, who is the adopted daughter of singer Lionel Richie, was arrested last December for driving under the influence of alcohol.  In July she was found guilty and sentenced to four days in prison, a fine in the amount of $2048, and ordered to go through a treatment program. On August 24, she served 82 minutes in prison.