Hell hath no fury like a woman scorned -- and even pretty MILFs like Demi Moore are no exception to the rule.

A lot of people were surprised when it became clear that Moore's soon-to-be-ex-husband Ashton Kutcher is swapping spit with former 'That '70s Show' co-star Mila Kunis, but -- horny guys of various persuasions aside -- no one took the news quite as hard as Demi.

"She's not psyched about Ashton and Mila," said an obvious-stating pal of Moore's. "She was always insecure over the course of her marriage. So yeah, it's hurtful that he's with someone he knew the whole time he was with her."

Adding salt to the wound: Kunis was recently named Esquire's Sexiest Woman Alive, but chances are good Demi likes all those steamy photos in one place. Makes it a lot easier to decoupage them onto dartboards.

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