Mackenzie Phillips has been busted at LAX for allegedly possessing heroin and cocaine. She's in custody right now.

At 10:00 AM, officers responded to Terminal 4, where 48-year-old Phillips was being screened by TSA. During the screening process, some baggies and balloons believed to contain heroin and cocaine were recovered.

The former "One Day at a Time" star has had a long history of drug abuse.