Look of the Day

WHAT SHE WORE
A '50s-inspired Christian Dior design with silver Sergio Rossi slingbacks and a red leather belt and bag

WHERE
The Chicago premiere of Public Enemies

WHY WE LOVE IT
Cotillard added a punk touch to her pretty-in-pink party look with a double-buckle grommet belt. Give your own floaty cocktail dress a rock and roll spin with a tough studded waist cincher.

• Add to Twitter