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Melissa Joan Hart's new memoir is called "Melissa Explains It All," and among the things the actress is explaining in the tome are her past drug-fueled exploits and celebrity hookups.

Speaking to Life & Style magazine about the book, which comes out Oct. 29, the former teen star of "Clarissa Explains It All," now 37, said, "I experimented with weed, Ecstasy, mushrooms and mescaline for about a year and a half." She also claimed that in 1999, during her "third or fourth time on Ecstasy," she made out in a limo with another girl on the way home, and then arrived at a photo shoot the next day while still high.

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However, Hart insists that, while she dabbled in drugs, she never became addicted. "I was kind of running with a bad crowd," she said. "I just didn't enjoy taking drugs. I don't like the loss of control."

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Hart also details some of her high-profile hookups in the book: She says she made out with Jerry O'Connell, whom she dubs a "man-whore," and Backstreet Boy Nick Carter. One star whose charms she didn't succumb to: Ashton Kutcher, who she says she tried to eject from her parties not once, but twice, for making "smartass remarks." Hart says, "Ashton and I just didn't get along."