Bobbing for Texture

Celebrity hairstylist Robert Vetica (he also works with Scarlett Johannson and Salma Hayek) says the key to this kind of texture is mousse. After raking a golfball-sized amount of Kevin Murphy’s Body Builder Volumizing Mousse ($25) through Cotillard’s hair, he blew it out and wrapped sections around a ¾-inch curling iron, finishing with Davines' Defining Invisible Styling Cream ($22). “It maintains control, without looking too perfect or product-y,” he says.