UPDATE 9/26/13 8:03 AM: A source close to Paris Hilton tells E! News, "There's no way this ever happened. Paris has never been friends with or partied with Melissa. They don't run in the same social circle. Melissa is obviously using Paris' name to sell her new book and make it seem more interesting."
Melissa Joan Hart is leaving no stone unturned!
The former child actress is revealing shocking details about growing up in Tinseltown in her new tell-all titled, what else, Melissa Explains It All.
The book is set to hit shelves on Oct. 29, but she shared some of the more shocking tidbits with Life & Style magazine.
The 37-year-old confessed to surprising hookups with a few very famous faces as well as her drug-fueled days of partying among young Hollywood's elite.
"I experimented with weed, Ecstasy, mushrooms and mescaline for about a year and a half," she confessed.
Melissa recalled one particular night when she took Ecstasy at the Playboy Mansion in 1999, made out with a girl in a limo ride home and then heading to a Maxim photo shoot while still high on the party drug.
"That was my third or fourth time on Ecstasy," she admitted.
But despite her party animal ways, Melissa's experimentation with drugs never developed into an addiction she says.
In fact, she explained that she turned down an offer of cocaine from none other than Paris Hilton, whose rep has since denied the claim to E! News.
"I was running with a bad crowd. I just didn't enjoy taking drugs," Melissa told the magazine. "I don't like the loss of control."
But the hotel heiress isn't the only one that Melissa is putting on blast in her autobiography.
She dishes about her hookups with Jerry O'Connell and even Backstreet Boys' Nick Carter.
The mother of three added that she kicked Ashton Kutcher out of her house parties twice after he had made "smartass remarks."
"Ashton and I just didn't get along," she said.
Wow—this is a whole new other side to Clarissa Darling that we never knew about!
(Originally published Sept. 25, 2013, at 10:44 a.m. PT)