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Mackenzie Phillips' stepmom Michelle Phillips has lashed out again at the former child star for claiming in her new book she had a decade-long affair with her father, 60s singer John Phillips.

"I'm so embarrassed — and mad," Michelle, 65, tells Vanity Fair. "At Oprah, at the publisher, and at Mackenzie, who should be on a psychiatrist's couch, not on TV....."

"Is this all true? We'll never know, because she waited until John was dead...." she continued. "If you're going to make these accusations and they don't hurt anyone living, that's one thing.

"But Mackenzie has affected the lives of all her nieces and nephews, who are not going to school today and are staying home sobbing instead," Michelle continued.

"And the book has come out just at the time that Chynna [a onetime member of the group Wilson Phillips] has to go out on the road with her new album [of Christian music], Chynna and Vaughan," Michelle added. "She said, 'Mom, what am I gonna do — not promote my album?' So she's going out today, head held high."

In the new issue of Us Weekly, Chynna says she isn't upset at her stepsister, despite the shocking revelation.

"I have pretty much come to peace with the fact that she's written this book and that it's been a cathartic experience for her," she tells Us Weekly.