And we can hardly blame her!
"[Because] they're really serious. She's not psyched about Ashton and Mila."
We would gladly babysit their adorbzies children for a competitive hourly wage!
But look at it from the G.I. Jane's perspective!
When an ex immediately starts hooking up with a girl he was supposedly just friends with during the relationship, it makes a person assume the worst!!
The source explained:
"[Demi] 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."
Was Kelso stuffing his Todd Rundgren 8-track into Jackie's tape deck back when Demi assumed her man was being faithful??
Poor gurl must be dying to find out!