The 46-year-old Insurgent actress stunned on the black carpet in a little black dress.
Naomi is at the film festival to promote her movie, The Sea of Trees, which also stars Matthew McConaughey.
The movie follows an American and Japanese man who are lost in a forest near Mt. Fuji and searching for a way out.
FYI: Naomi is wearing Bulgari.
10+ pictures of Naomi Watts showing off her style at an event during Cannes.. More Here! »