Reps say Katie Holmes is not pregnant

Katie Holmes is not expecting her second child with husband, Tom Cruise, a rep for the actress, 28, tells

Adds a rep for Cruise, 45: "She is not pregnant."

Holmes appeared to be sporting a possible bump in photos as she worked the red carpet in a one-shouldered, silk charmeuse Monique Lhuillier gown at the the L.A. premiere of Cruise’s new drama Lions for Lambs Thursday.

But a source at the event tells Us, "She didn't look pregnant at all in person, quite the opposite."