Kirsten Stewart Pregnant with Robert Pattinson's baby?

I first read about this some time ago on a gossip rag and dismissed it as just that... rag gossip. But today the NY Daily News is also running with the story saying;

An "insider" quoted by Australia's New Weekly says, "When [Stewart] worked out she was late, she obviously started to thinking that she could be pregnant. And because of the timing, she thinks Rob could be the father."

The gossip mag also reports she had a friend buy a home pregnancy test for her, and that she is "very nervous about the whole situation."

The article is accompanied by a photo of Stewart with a tiny round belly protruding from her pants on the set of her upcoming film "The Runaways," in which she plays rocker Joan Jett.

Can you say Art imitates life? Insane. Where will this leave the upcoming Twilight films if she is pregnant? They could always write it in since it does fit the story as you twilight fans know.