The actress looked suitably glamorous at the event, sporting a demure white dress and a slick of red lipstick.
Nicole was joined by her co-stars Tim Roth, Jeanne Balibar and Paz Vega as well members of the movie’s production team including producer Pierre Ange Le Pogam and director Olivier Dahan.
Plenty of A-list Hollywood stars are set to descend on the South of France for the 67th Annual Cannes Film Festival, including Ryan Gosling who is making his directorial debut with 'How To Catch A Monster'.
Nicole poses with Tim Roth
The long-awaited biopic ‘Grace Of Monaco’ will open the festival and early reviews of the movie have been mixed.
The film has also been criticised by Monaco’s Royal Family, with Princess Stephanie of Monaco declaring that she will “never see the film”.
“This film does not praise Monaco or the great man that was my father, Prince Rainier,” she told The Monaco Times.
See all the pictures from the photocall in the gallery below...