Heidi Fleiss is also on the show. She seems to be getting treatment more out of loneliness than anything else. She is a meth addict living all alone in a big house in an isolated area. Her only company is about 20 exotic birds that she inherited from another madame that died. She is not the first person I've seen entering rehab because of the loneliness and isolation that sometimes accompanies addiction.
MacKenzie Phillips is also on the show, but already had 8 months of sobriety when she entered (she says she is there to strengthen her sobriety). The show was filmed before she released her book in which she admitted she had a long-term incestuous relationship with her famous father, musician John Philips. She did admit the incest to Dr. Drew but would only do so off camera.
There are other celebrities as well but these are the ones that stand out to me the most. As usual, I will be absolutely riveted to the show. I only regret that in past seasons, the show seems to be focusing as much on the process of recovery as the drama between the drug addicts themselves and the trouble they often create for the staff (some of them are really hard on the staff). But I suppose it's ridiculous to wish people could just enter rehab and peacefully work on a lifetime of trauma and painful issues without taking it out on each other and the people who are trying to help them.