Winnie Harlow wears a Ralph & Russo to the premiere of "Oh Mercy! (Roubaix, Une Lumiere)."
'Oh Mercy! (Roubaix, Une Lumiere)' —
Winnie Harlow wears a Ralph & Russo to the premiere of "Oh Mercy! (Roubaix, Une Lumiere)."
Andreas Rentz/Getty Images
Rather than wearing a gown, Lea Seydoux wore custom Louis Vuitton trousers and and an embellished bodysuit.
'Oh Mercy! (Roubaix, Une Lumiere)' —
Rather than wearing a gown, Lea Seydoux wore custom Louis Vuitton trousers and and an embellished bodysuit.
Pascal Le Segretain/Getty Images
In a truly unexpected turn, Marion Cotillard wore a crop top and shorts, topped with a distressed denim kimono from Balmain.
'Matthias and Maxime' —
In a truly unexpected turn, Marion Cotillard wore a crop top and shorts, topped with a distressed denim kimono from Balmain.
LOIC VENANCE/AFP/Getty Images
Ahead of the "Once Upon a Time... in Hollywood" screening, British model Leomie Anderson strikes a pose in a mirror-embellished Rami Kadi gown.
'Once Upon a Time ... in Hollywood' —
Ahead of the "Once Upon a Time... in Hollywood" screening, British model Leomie Anderson strikes a pose in a mirror-embellished Rami Kadi gown.
VALERY HACHE/AFP/Getty Images
Elle Fanning's takes a retro turn in Dior. The tulle skirt and silk organza shirt took 450 hours to create, the brand revealed on <a href="index.php?page=&url=https%3A%2F%2Fwww.instagram.com%2Fp%2FBxwltz2Igc9%2F" target="_blank" target="_blank">Instagram</a>.
'Once Upon a Time ... in Hollywood' —
Elle Fanning's takes a retro turn in Dior. The tulle skirt and silk organza shirt took 450 hours to create, the brand revealed on Instagram.
Andreas Rentz/Getty Images
Margot Robbie, who plays Sharon Tate in the film, catches the spotlight in a sequined tunic and matching trousers -- both Chanel couture.
'Once Upon a Time ... in Hollywood' —
Margot Robbie, who plays Sharon Tate in the film, catches the spotlight in a sequined tunic and matching trousers -- both Chanel couture.
Vittorio Zunino Celotto/Getty Images
Aishwarya Rai wore a cloud-like custom gown from Ashi Studio to the screening of "La Belle Epoque."
'La Belle Epoque' —
Aishwarya Rai wore a cloud-like custom gown from Ashi Studio to the screening of "La Belle Epoque."
Eamonn M. McCormack/Getty Images
Russian model Natalia Vodianova wore bejeweled Versace on the red carpet.
'La Belle Epoque' —
Russian model Natalia Vodianova wore bejeweled Versace on the red carpet.
ALBERTO PIZZOLI/AFP/Getty Images
Marion Cotillard (flanked by French actors Jean Dujardin and Gilles Lellouche) wears a halterneck crop top and matching floor-length skirt.
'La Belle Epoque' —
Marion Cotillard (flanked by French actors Jean Dujardin and Gilles Lellouche) wears a halterneck crop top and matching floor-length skirt.
ANTONIN THUILLIER/AFP/Getty Images
Newlyweds Priyanka Chopra (wearing a strapless Georges Hobeika gown) and Nick Jonas attend the screening of "Les Plus Belles Annees D'Une Vie."
'Les Plus Belles Annees D'Une Vie' —
Newlyweds Priyanka Chopra (wearing a strapless Georges Hobeika gown) and Nick Jonas attend the screening of "Les Plus Belles Annees D'Une Vie."
Andreas Rentz/Getty Images
Helen Mirren, wearing Elie Saab, shows off bubblegum pink hair on the red carpet.
'Les Plus Belles Annees D'Une Vie' —
Helen Mirren, wearing Elie Saab, shows off bubblegum pink hair on the red carpet.
Pascal Le Segretain/Getty Images
Penelope Cruz wears gown from Karl Lagerfeld's last Chanel couture collection to the screening of "Pain and Glory."
'Pain and Glory' —
Penelope Cruz wears gown from Karl Lagerfeld's last Chanel couture collection to the screening of "Pain and Glory."
Pool/Getty Images Europe/2019 Getty Images
Model Liya Kebede wears Valentino.
'Pain and Glory' —
Model Liya Kebede wears Valentino.
John Phillips/Getty Images
Singer Madison Beer gets a hand with her Georges Hobeika gown.
'Pain and Glory' —
Singer Madison Beer gets a hand with her Georges Hobeika gown.
Andreas Rentz/Getty Images
Bollywood star Deepika Padukone wears a statement-making custom gown from Dundas.
'Rocketman' —
Bollywood star Deepika Padukone wears a statement-making custom gown from Dundas.
ANTONIN THUILLIER/AFP/Getty Images
Priyanka Chopra's sequined Roberto Cavalli glitters along the red carpet.
'Rocketman' —
Priyanka Chopra's sequined Roberto Cavalli glitters along the red carpet.
Pascal Le Segretain/Getty Images
Amber Heard wears a sequined dress, accessorized with a wide leather belt and Chopard jewelry, to the screening of "Les Miserables" on day two of Cannes Film Festival.
'Les Miserables' —
Amber Heard wears a sequined dress, accessorized with a wide leather belt and Chopard jewelry, to the screening of "Les Miserables" on day two of Cannes Film Festival.
Vittorio Zunino Celotto/Getty Images
Actress Sririta Jensen wears a Michael Cinco confection.
'Les Miserables' —
Actress Sririta Jensen wears a Michael Cinco confection.
Vittorio Zunino Celotto/Getty Images
Former Girl's Generation member Jessica Jung wears a billowing ball gown designed by Rami Kadi to the opening ceremony and screening of "The Dead Don't Die."
'The Dead Don't Die' —
Former Girl's Generation member Jessica Jung wears a billowing ball gown designed by Rami Kadi to the opening ceremony and screening of "The Dead Don't Die."
Samir Hussein/WireImage/Getty Images
Twenty-one-year-old Elle Fanning -- who is now the youngest ever Cannes jury member -- looks triumphant in Gucci.
'The Dead Don't Die' —
Twenty-one-year-old Elle Fanning -- who is now the youngest ever Cannes jury member -- looks triumphant in Gucci.
Matt Winkelmeyer/Getty Images
French actress Frederique Bel's diaphanous cape made for a dramatic red carpet moment.
'The Dead Don't Die' —
French actress Frederique Bel's diaphanous cape made for a dramatic red carpet moment.
Alberto Pizzoli/AFP/Getty Images
Selena Gomez wears a Louis Vuitton skirt and bustier, accessorized with Bulgari diamonds.
'The Dead Don't Die' —
Selena Gomez wears a Louis Vuitton skirt and bustier, accessorized with Bulgari diamonds.
Tony Barson/FilmMagic/Getty Images
Brazilian model Alessandra Ambrosio wore British couturiers Ralph & Russo.
'The Dead Don't Die' —
Brazilian model Alessandra Ambrosio wore British couturiers Ralph & Russo.
CHRISTOPHE SIMON/AFP/Getty Images
Eva Longoria shows off the thigh-high slit of her custom Alberta Ferretti gown.
'The Dead Don't Die' —
Eva Longoria shows off the thigh-high slit of her custom Alberta Ferretti gown.
Christophe Simon/AFP/Getty Images
Julianne Moore wears emerald green Dior and matching Chopard earrings.
'The Dead Don't Die' —
Julianne Moore wears emerald green Dior and matching Chopard earrings.
Matt Winkelmeyer/Getty Images
Tilda Swinton looked otherworldly in a floor-length silver gown.
'The Dead Don't Die' —
Tilda Swinton looked otherworldly in a floor-length silver gown.
Vittorio Zunino CelottoGetty Images
German model Barbara Meier poses in a Ziad Nakad dress.
'The Dead Don't Die' —
German model Barbara Meier poses in a Ziad Nakad dress.
Christophe Simon/AFP/Getty Images
Bella Hadid dons a sheer tulle number by Dior to the screening of "Rocketman" on the third day of the Cannes Film Festival.
'Rocketman' —
Bella Hadid dons a sheer tulle number by Dior to the screening of "Rocketman" on the third day of the Cannes Film Festival.
VALERY HACHE/AFP/Getty Images
Victoria's Secret model Romee Strijd wears a white lace Etro gown.
'The Dead Don't Die' —
Victoria's Secret model Romee Strijd wears a white lace Etro gown.
Gisela Schober/German Select/Getty Images