Video: See Birthday Girl Scarlett Johansson's Sexiest Onscreen Moments

Scarlett Johansson - Saturday Night Live Promo ClipNatalie Portman & Scarlett Johansson Team Up

In This Photo: Scarlett JohanssonSCARJO CLAIMS A VICTIM - Scarlett Johansson is seen filming a scene where she knocks a man out with a rock on the set of her new film "Under the Skin" on the beach in Scotland. The dark haired Scarlett could be seen discussing the scene with director Jonathan Glazer and she even had her feet covered with plastic bags to keep her warm in the cold waters.(November 3, 2011 - Photo by PacificCoastNews.com)