The Oscar-nominated actress was on hand to premiere her new film The Search, by director Michel Hazanavicius - who also directed her in the 2011 smash-hit The Artist.
The actress wore a quirky strapless velvet dress, which took inspiration from a double-breated jacket and featured a double row of buttons.
Joining Berenice on the red carpet were a host of world famous models, including Cara Delevingne - who flew to the French Riviera after her sister Poppy's wedding.
Wearing a strapless sequin Chanel Couture dress, Cara looked stunning with side-swept hair and bright red lips.
L'Oreal ambassador Lara Stone wowed the fans in a silk crepe asymmetrical bright pink dress by Calvin Klein. The model, who was unveiled as the make-up brand's new face in October, is married to comedian David Walliams. She welcomed their first child, a baby boy named Alfred, just over a year ago.
Also at Wednesday's premiere were Rosie Huntington-Whitely, Lady Victoria Hervey, and Barbara Palvin.