There’s a lot of Demi Moore and Ashton Kutcher gossip in this week’s tabloids, but most of it is related to Ashton’s recent Nightline interview and the overanalysis about whether he wants Demi to get pregnant because she is, in his words, a “genetic freak”. However, In Touch Weekly does have an interesting story about Demi getting jealous over Ashton’s newest costar, Natalie Portman.

An insider tells In Touch that Demi Moore is “worried” about Ashton and his Friends With Benefits costar Natalie Portman spending time together.

“It’s driving Demi crazy… she knows how much Ashton loves her, but she’s concerned that he is working with Natalie, who’se almost 20 years younger than she is.”

Demi can be very self-conscious about the 15-year age difference between herself and her husband – and having to watch him film sexy scenes with 28-year-old Natalie “isn’t making it any easier.”

Demi has never been jealous of Ashton’s costars before, but she may be on to something this time. Three days after Ashton and Natalie filmed a steamy kissing scene, Ashton told Howard Stern that love scenes are like “free cheating.” Though he was careful to add that he confessed everything to his wife because she’s his “best friend,” the insider says that Demi isn’t as cool with it as she’s letting him think.

“I’m sure Ashton doesn’t even realize it’s bothering Demi,” the insider says.

“Natalie has had some on-set romances in the past,” a friend tells In Touch, adding that even thought she’s in a serious relationship with dancer Benjamin Millepied, she still flirts with other men. “She is in love with Ben, but Natalie has always had a way with men.”

And though she no interest in getting a rep for being the “other woman” it’s clear Natalie has chemistry with Ashton. “Natalie loves his sense of humor and likes spending time with him,” says the friend.

“Demi has told Ashton that she’s visiting him on the set to get to know Natalie,” says the insider. “But she’s actually going to check up on him.”

[From In Touch Weekly, print edition]

Yeah, I totally doubt all of this. I doubt Ashton is all over Natalie, and I doubt she finds him charming in the least. Most of all, I doubt Demi is insecure about Ashton at all. The subtext seems to be that Demi is a bundle of insecurity just because Natalie is younger, when clearly that’s not what Ashton cares about.

Going back to the whole “Demi Moore is a genetic freak” thing, Us Weekly also has a story about Demi undergoing fertility treatments in the hopes of having Ashton’s baby. According to that source, “Ashton has been uneasy that things haven’t happened fast enough… he’s constantly calling the doctor to find out is there’s something else they can do to get pregnant. It has to be exhausting. He’s ready to be a dad.” The source also claims: “They’re not even thinking of a surrogate as an option. At least not yet.”