Clarissa is explaining it all ... and dissing some of her famous hookups!

Melissa Joan Hart continues to kiss and tell about past smooches with stars like Nick Carter, James Van Der Beek and Ryan Reynolds on today's episode of "Bethenny" -- but this time, she's also rating them.

And she doesn't have a lot of nice things to say.

Check out the video above to see which star she doesn't "find all that attractive" (yeah, present tense, ouch!) and who she had a "bizarre" make-out session with in Australia.  

While chatting with Bethenny Frankel, the former "Sabrina, the Teenage Witch" star also talked about sneaking Britney Spears into a nightclub back in the day.

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