Sean Penn is obviously looking to strike whilst the iron is hot, by signing up for the Doug Liman (Swingers, The Bourne Identity) directed thriller, Fair Game. Story is based on the true life shenanigans of CIA agent Valerie Plame, who had her cover blown by members of the Bush Administration because they were pissed off at her husband, who was an ambassador. Kate Beckinsale just completed a film called Nothing But The Truth which is loosely based on Plame's life, but this one will be an official biopic. Naomi Watts has already been cast as Palme, while Penn will play her husband, Ambassador Joseph Wilson.