— -- The Cannes Film Festival kicked off today, and the stars attended the opening ceremony in their finest couture.
However, perhaps the most discussed gown belonged to Lupita Nyong'o, who dazzled in a custom emerald green embroidered gown by Gucci.
"It's #GrasshopperGreen for @festivaldecannes opening night. Thank you @Chopard @Gucci and Uganda's women for the hair inspiration. #NseneneSeason #cannes2015," she wrote on Instagram.
However, Nyong'o wasn't the only one who caused jaws to drop. Natalie Portman stunned in a bright red Dior dress, as did model Karlie Kloss in Atelier Versace Couture.
Here are a few other of the most stunning looks from the red carpet.
Jane Seymour
Jane Seymour attends the 68th annual Cannes Film Festival on May 13, 2015 in Cannes, France.
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Bar Rafaeli
Bar Rafaeli attends the 68th annual Cannes Film Festival on May 13, 2015 in Cannes, France.
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Natalie Portman
Actress Natalie Portman at the 68th international film festival, Cannes, France, May 13, 2015.
AP Photo
Julianne Moore
Julianne Moore at the 68th international film festival, Cannes, France, Wednesday, May 13, 2015.
AP Photo
Karlie Kloss
Karlie Kloss at the 68th international film festival, Cannes, France, Wednesday, May 13, 2015.
AP Photo
Sienna Miller
Sienna Miller during the 68th annual Cannes Film Festival on May 13, 2015 in Cannes, France.
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