Moore spoke briefly with her soon-to-be-boy-toy lover, who was actively trying to court another lady at the party, and both stars initially had no thoughts of romance.
But Moore tells the February issue of style magazine Vanity Fair she soon found herself falling for the actor in 2003.
She accepts, "If somebody would have said, 'OK, here is the prediction: You're going to meet a man (who is) 25 years old and he's going to see being with you and having your three kids as a bonus,' I would have said, 'Keep dreaming.'"
The 44-year-old actress adds, "I think it (the romance) caught us both by surprise, and particularly him.
"He was in this real rise of his career just as we met, which, for a young man, is prime opportunity for heavy-duty play."
Moore and Kutcher were married in September 2005 and the actress admits she isn't ruling out starting a family with her younger husband: "Once you hit three, when you're outnumbered, it's really, like, what's the difference between (three or) four or five?"
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