One thing I've learned from experience as a nurse and working with drug addicts is they are extremely unpredictable and untrustworthy. These people are major manipulators and tend to fabricate lies for attention. You can't believe a word that comes out of their mouths.

Which is why I ignore celebs (Whitney) who claim to have kicked their drug habits. Once a druggie, always a druggie.

When I heard about the Mackenzie Phillips rape/incest interview with Oprah (who believes every crazy thing these celebs tell her), I knew Mackenzie was making the whole thing up.

According to her stepmother, Michelle Williams, who was married to Mackenzie's dad -- the one Mac claims raped her when she was 19 -- Mackenzie has a history of lying and manipulative behavior to get what she wants (drugs). I also wondered if there was a book deal or movie deal in the works. Sure enough, Mackenzie has a book coming out just in time to keep fueling her drug habit.

Showbiz411's Roger Friedman also suspected Mackenzie was lying and reached out to Michelle Phillips who confirmed Mackenzie is lying to sell copies of her book.

“She told me, then she called me back and said, ‘You know I’m joking.' I said it wasn’t funny. Mackenzie said, ‘I guess we have different senses of humor.’ John was a bad parent, and a drug addict. But fucking his daughter? If she thinks it’s true, why isn’t she with a good psychiatrist on a couch? I think it’s unconscionable that Oprah would let her do her show. I have every reason to believe it’s untrue. Oprah should be more judicious about who she has on her show."

"Mackenzie has a lot of mental illness. She’s had a needle stuck up her arm for 35 years. She was arrested for heroin and coke just recently. She did ‘Celebrity Rehab’ and now she writes a book. The whole thing is timed.”

The whole thing is also ridiculous. After the entire pregnant male fiasco, I don't know why people continue to waste their time watching Oprah's show.