Melissa Joan Hart 'High on Ecstasy' for Maxim PHOTO Shoot: Actress Exposes Sexy Celebrity Hook-Ups, Wild Partying/Drug Use in New Memoir 'Melissa Explains it All'

Former Nickelodeon starlet Melissa Joan Hart will release a new memoir entitled Melissa Explains It All on October 29. In the revealing tell-all, Hart exposes her wild partying days a young Hollywood star - including several sexy celebrity hook-ups! The now 37-year-old actress explains that during her 1999 Maxim cover photo shoot, she was still high on Ecstasy after partying at the Playboy Mansion. Read on for even more scandalous deets!

Although Melissa Explains It All doesn't hit shelves until October, Life & Style has an exclusive inside look into Hart's crazy past:

"I experimented with weed, Ecstasy, mushrooms and mescaline for about a year and a half," Joan tells the popular gossip mag.admits to the magazine. One time in 1999, Hart took some Ecstasy at the Playboy Mansion and ended up making-out with a girl in the limo ride home. After that, she headed straight to a Maxim photo shoot - she was still high! "That was my third or fourth time on Ecstasy," Hart reveals. 

But Hart didn't let things get out-of-hand. Paris Hilton once offered her cocaine, but she turned it down - "I was kind of running with a bad crowd... I just didn't enjoy taking drugs. I don't like the loss of control." Hilton's reps denied this ever happened.

And as for those sexy celebrity hook-ups? Hart once made-out with Jerry O'Connell (she considers him a "man-whore") and Backstreet Boy crooner Nick Carter. But Hart never had a thing for Ashton Kutcher - she tried kicking the actor out of her parties (twice) for making "smartass remarks." As Hart recalls, "Ashton and I just didn't get along."

That's some crazy stuff! For more info, check out the latest issue of Life & Style and be sure to pick-up Hart's new book on Oct. 29!