De rouille et d'os
In 2012, he starred in Jacques Audiard's "Rust and Bone" ("De rouille et d'os") alongside Marion Cotillard. The film premiered at the 2012 Cannes Film Festival and was a critical and box office hit in France. On 22 February 2013, Matthias won the César Award for Most Promising Actor for his role in "Rust and Bone".