No, she's not hiding a machine gun under there!

'Grindhouse' star ROSE McGOWAN didn't want to miss out on the Cannes Film Fest fun, so she wore a black cast to cover her broken foot on the red carpet. She told People.com that the injury happened as she was running to meet her trainer and hit the doorway with her foot. Ouch! But ever the trooper, she waited till after the work-out to go to the hospital.