Scarlett Johansson was spotted jogging this past weekend with new beau Sean Penn and buddy Owen Wilson. And after a photo of her surfaced from the friendly run showing an ever-so-slight belly, rumors have been running rampant that the 'Iron Man 2' star is pregnant.

Not the case, her reps said. "Scarlett is not pregnant," Johansson's publicist, Marcel Pariseau, told PEOPLE. "She's been training for 'The Avengers' for over four months and is in the best shape of her life."

In fact, Pariseau blames her outfit: "She's outside running and it's simply the placement of her shirt that is misleading. She was followed and photographed for over 20 minutes and I'm sure there are other photos in the series that show and prove that she is not pregnant." See the incriminating photo at PEOPLE.