Melissa Joan Hart Explains It All In New Memoir; Sabrina The Teenaged Witch Dishes on Ryan Reynolds, James Van Der Beek

Melissa Joan Hart, who was the star of "Clarissa Explains It All," and she's doing just that in a new memoir called "Melissa Explains It All."

In her new memoir, Melissa Joan Hart, the "Sabrina the Teenage Witch," cast a spell on her Hollywood co-stars as she dishes on celebrity hookups and her first on-screen kiss.

Melissa Joan Hart told Access Hollywood Live that her first onscreen kiss came when she was working on the Nickelodeon show "Clarissa Explains It All" None other than Dawson himself, James Van Der Beek. She said "It was really awkward and really uncomfortable ... just weird."

Melissa Joan says Ryan Reynolds, "gave me this beautiful watch and ran out of my dressing room. I chased him down and in the headlight of his car, I stopped him ... and I just grabbed him and kissed him. We just made out all night. Ryan has grown up nicely."

Melissa Joan Hart revealed she made out with Backstreet Boy Nick Carter saying "It was just one of those hot moments."

In "Melissa Explains It All," Hart calls Jerry O'Connell "man-whore," that she made out with. Melissa Joan Hart also reveals she hooked up with Nick Carter from the Backstreet Boys.

Melissa Joan Hart ended her Hollywood dating streak the night she kissed Jerry O'Connell, which  was also the night she met Mark Wilkerson, who she married and had three kids with. She said "I met Mark and that [same] night I made out with Jerry. But, the next morning at the Derby races, Jerry is hitting on someone else and I said, 'Oh, I see how this is going to be.' And then Jerry said to me, 'When we get back to LA are we going to hang out?' And I said, 'I don't think so, I think I met the man I'm going to marry."