Following a wild rumor started by an Australian magazine report that Kristen Stewart is pregnant with Robert Pattinson's love child, Kristen has been telling everyone on the set of her new movie, The Runaways, that it's completely false.

An insider on the set of the film about the life story of rocker Joan Jett and her band, tells Life & Style: "Joan and Kristen managed to have a laugh about the rumor. Kristen just thought it was ridiculous."

As Life & Style reports, Kristen and Rob have since broken up and he's moved on to his Remember Me co-star Emilie de Ravin.

For more on Robert and Kristen's split and inside details on Twilight, pick up this week's issue of Life & Style, on newsstands now!

Photo Credit: Retna