Biography: In 2003, Green made her feature film debut in Bernardo Bertolucci's NC-17-rated film The Dreamers with Michael Pitt and Louis Garrel. She played the role of Isabelle and in addition to acting, also composed the score for the film. Described by Bertolucci as "so beautiful it's indecent", her performance brought her critical acclaim, noted as one of the best of the decade, as well as some notoriety for her explicit, extensive full frontal nudity. While filming Dreamers, Green was said to have found Bertolucci manipulative, though in a creative way that wasn't pushy. In comparison to her previous stage acting, she has said that acting in front of the camera makes you its "plaything."

She played the Countess, Clarisse de Dreux-Sobise in the 2004 French film, Arsène Lupin, directed by Jean-Paul Salomé and starring Romain Duris and Kristin Scott Thomas. The film received mixed reviews, but she was raved as the best performance of that year. In 2005, she portrayed Sibylla of Jerusalem in Ridley Scott's Kingdom of Heaven, starring opposite Orlando Bloom as Balian. Again, she was credited along with Rachel Weisz in The Constant Gardener as one of the best performances of that year.

Green has recently been cast as "Bond girl" Vesper Lynd in the upcoming James Bond film Casino Royale with new 007 actor Daniel Craig. She is the fourth French actress to portray a "Bond girl," and the first one born in the 1980s. Casino Royale will be released in theaters worldwide on November 17, 2006. In May of 2006, Maxim magazine named her #20 in its annual Hot 100 List.

Green has also joined the cast of New Line's His Dark Materials: The Golden Compass, based on Phillip Pullman's novel, and directed by Chris Weitz. She will play Serafina Pekkala, the queen of witches who guides Lyra Belacqua (Dakota Richards) on her journey to a parallel universe. Green will join Daniel Craig (Lord Asriel), Adam Godley (Pantalaimon), and Nicole Kidman (Marisa Coulter) in the cast.