Marion Cotillard attended the premiere of her latest movie, ‘De Rouille et D’Os’ during the 2012 Cannes Film Festival this evening.

The French actress was not going to be upstaged by the L’Oreal girls as she donned a beautiful “go big or go home” Christian Dior Couture ball gown.

Her simple strapless sweetheart neckline gown has a black bodice and navy tulle skirt. It’s such a shame none of the photographers captured it properly.

A metal waistband nipped in her waist as Marion only added subtle Chopard jewels, including a hair accessory for her voluminous bun.

Parisian elegance at its finest.

Credit: Getty