"Elle Fanning bringing a little Grace Kelly glam to the #cannes2017 Opening Night Gala Dinner," the brand wrote on Instagram.
The vampy outfit was very different to her pink Vivienne Westwood gown from earlier in the day, which actually bore an embroidered unicorn.
Elle's enviable street style has also been on full display at Cannes, with the 19-year-old actress stepping out in a series of summery ensembles.
Her blue Temperley London dress caught the eye of spectators, with its scalloped eyelet details and high neckline with a black bow. She highlighted the embroidered red lips on the dress with the 'Narcisse' caged cutout sandals from French footwear brand Laurence Dacade, which you can shop for AUD$909 here.
Meanwhile, her ab-baring black crop top and star print midi skirt made Elle a champion of Spring style.
We can't wait to see what the Neon Demon star wears next.