Mackenzie Phillips has pleaded guilty to possessing cocaine and will go into drug treatment.

The former “One Day at a Time” star entered the plea Friday in Los Angeles to a felony drug possession count. The district attorney’s office says two counts of possessing heroin and a needle were dismissed, and she was ordered to complete an 18-month program.

Phillips, 48, was arrested Aug. 27 at Los Angeles International Airport after airport police found small amounts of narcotics during a security screening.

Phillips is the daughter of John Phillips, who was in the pop group the Mamas and the Papas. She has a long history of drug abuse, which led to her firing from “One Day at a Time” in 1982.