Now that the romance between Ashton Kutcher and Mila Kunis is finally out in the open, Kutcher's ex-wife Demi Moore struggling to deal with it. A source says it's "like a knife in her heart." Ouch!

"Demi is devastated that Ashton has moved on so quickly and is dating Mila," says the source. "She is beyond heartbroken."

The source maintains that Demi may have been holding out for the pair to get back together, but now she realizes that's not really a reality.

"She kind of knew it was definitely over between them but I think she was still holding out a little hope for a reconciliation," they say. "Now he's actually dating someone else she knows that is not going to happen."

[NY Post]