Now that new photos of Mila Kunis and Ashton Kutcher kissing have made the rounds, a new report reveals Demi Moore is completely "heartbroken" over her ex's new romance.

"Demi is devastated that Ashton has moved on so quickly and is dating Mila," a friend tells Radar Online. "She is beyond heartbroken."

The source continues, "Even though Ashton cheated on her all the time, it was with random girls, it wasn't a relationship like it is with Mila and that is what is killing Demi now."

And while Demi knew the new couple had been carrying on for a while, the new photos of them kissing appears to have pushed her over the edge.

"Seeing photos of him kissing another woman is too much for her to handle, it's like having her nose rubbed in it time and time again," the friend continues. "She kind of knew it was definitely over between them, but I think she was still holding out a little hope for a reconciliation -- now he's actually dating someone else she knows that's not going to happen."

Demi also has a major problem with the fact that Mila, 28, is much younger than she is. "Each time Demi hears about Ashton and Mila it breaks her heart. She really loved him despite the flaws in their marriage and to see him dating someone new, who is so much younger than she is, is like a knife in her heart," the source says.

Demi, 49, and Ashton, 34, split last fall after six years of marriage -- which was plagued by a number of cheating scandals involving Ashton. Demi appears to have since hit rock bottom, as evident by her hospitalization for alleged drug use and a rehab stint earlier this year.

Her relationship with her three daughters is also said to be on the rocks.

TELL US - FEEL BAD FOR DEMI? OR IS IT TIME FOR HER TO MOVE ON?