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10. In Christian Dior at the 2012 New York City screening of Rust and Bone.
Just one of many striking Dior looks.
9. In Vivienne Westwood at the 2009 European film premiere of Public Enemies.
Cotillard played Billie Frechette in the 1930's crime film Public Enemies alongside Johnny Depp and Christian Bale.
8. In Elie Saab Couture at the 2010 Screen Actors Guild Awards.
So playful.
7. In Christian Dior Couture at the 2012 Met Gala.
A modified version of an original runway look.
6. In Lefranc Ferrant at the Chopard 150th Anniversary Party at the 2010 Cannes Film Festival.
We love how sexy she makes a jumpsuit.
5. In Christian Dior at the 2010 Golden Globes.
This rich gem tone was the perfect color to bring out Cotillard's eyes.
4. In Jean Paul Gaultier Couture at the 2008 Academy Awards.
Not many women could elegantly pull off scales.
3. In Christian Dior Couture at the 2012 London premiere of The Dark Knight Rises.
So very Parisian.
2. In Christian Dior Couture at the 2009 Academy Awards.
If only the Oscars gave out a best-dressed award....
1. In Christian Dior at the 2012 American Film Institute Film Festival.
And the winner is...another Dior! We love how the surprise silhouette gives this simple color combo a whole new dimension.