The 24-year-old actress and Chloe, 17, were joined at the big event by their co-star Juliette Binoche and their director Olivier Assayas.
In case you missed it, check out the super dramatic trailer for the film.
FYI: Kristen and Chloe are wearing Chanel couture. Chloe is also wearing Chopard jewels.
10+ pictures inside of Kristen Stewart, Chloe Moretz, and more…