This site reveals that Juliette Binoche will play Didi Fancher in Cosmopolis! Didi is a 47-year-old art expert & one of Eric Packer's (Rob) love interests! Paul Giamatti will play Benno Levin, who is after Eric!
As, it was posted earlier here Mathieu Amalric, French actor & film director,
has also joined Rob in Cosmopolis!cosmopolisfilm