Kristen Stewart Denies She's Having Robert Pattinson's Baby

Kristen Stewart has been laughing off the out-there reports she's pregnant with Robert Pattinson's baby.

An Aussie tabloid ran the story, accompanied by a photograph of the actress sporting what looked like a little tummy on the the Los Angeles set of her new movie The Runaways.

While Rob's rep has refused to dignify the claim with a denial, Kristen has reportedly seen the funny side.

"Joan and Kristen managed to have a laugh about the rumor. Kristen just thought it was ridiculous," an on-set insider tells Life & Style.

The tabloid also reports that the Twilight co-stars have split, and Rob has turned his attention to his new leading lady, Emilie de Ravin.

Rob & Kristen's awards tease