In 2003, she published the autobiographical book Il n'y a pas beaucoup d'etoiles ce soir, with anecdotes of her day to day life as an actress. The French edition featured a cover designed by her sister Ghislaine.
One of her most noted performances was as the star of the film Stupeur et tremblements, adapted from the novel by Amélie Nothomb, for which she was awarded a César and a Prix Lumière for best actress in 2004. She plays a woman struggling with the difference in culture between the Japanese business world and the western, Belgian world, from which she comes. In 2005 or 2006[clarification needed] she returned to her native Lyon (to the Théâtre de la Croix Rousse), where she played the rôle of Edith in Philippe Faure's adaptation of Stefan Zweig's La Pitié dangereuse. She starred in 2007's two-time Academy Award-winning film La Vie en Rose, as Momone, Edith Piaf's best friend. In the 2008 film Sagan, she portrayed the writer Françoise Sagan, earning unanimous praise for her hauntingly accurate portrayal and for which she was again nominated for the César for best actress.
CSOJ - Alain Badiou Sylvie Testud appears on French television's program Ce Soir (En direct, channel 3) in conversation with militant philosopher Alain Badiou. The topic of this episode is "Faut-il réinventer l'amour?". Ms. Testud appears 46:18 minutes into the program and is in conversation with Badiou and the program host for about 24 minutes (no commercials, this show is in French).