Premiering her latest film Clouds of Sils Maria, Kristen was joined by co-stars Chloe Grace Moretz and Juliette Binoche, and director Oliver Assayas.
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Wearing a sequin-covered white jumpsuit from Chanel with nude heels, the outfit highlighted her newly dyed red hair for American Ultra, for which she is teaming up with her Adventureland co-star Jesse Eisenberg.
Juliette meanwhile showed off her chic fashion style with a monochrome shirt dress, while Chloe wore a ruffled, off-the-shoulder dress with a drop hem.
Joining the cast of Clouds of Sils Maria on the red carpet were the cast of Pulp Fiction by director Quentin Tarantino. The film won the Palme d'Or in Cannes in 1994 and was screened at this year's festival.
L-R: Kristen Stewart, Juliette Binoche, Chloe Grace Moretz and Oliver Assayas
Earlier in the day, Juliette and Chloe had attended the photocall for Clouds of Sils Maria, with Oliver. The pair hammed it up for the cameras, jumping and waving as they smiled. Kristen was unable to make it due to a later flight.
Chloe looked the epitome of Riviera chic in a boater's hat and all-white ensemble, while Juliette contrasted Chloe with black studded trousers, and a suit jacket.
It's been a busy few months for Kristen who has already filmed three films - American Ultra, Still Alice with Julianne Moore, and Anesthesia.
She also found the time to attend the 2014 Met Gala with best friend Riley Keough - who has also been attending the Cannes Film Festival this week - wearing a Chanel couture dress.
Kristen was unveiled late in 2013 as the new face of the fashion house. The news was confirmed as the actress, 23, jetted to Dallas for the brand's Metiers D'Art Paris-Dallas show.