

Blake Lively, former princess of the Upper East Side, decided to be another princess at the Cannes Film Festival's premiere of Slack Bay (Ma Loute) this evening. Take in her Cinderella gloriousness in all its detail, from the jewel flower-embellished front:
Neat bow tying her ruffly cupcake skirt in the back:
Crystal hair flower hanging right above her neck:
And a delicate bow headband in front:
A hint of a silver heel, Serena van der Woodsen's choice glass sipper:
This is not her movie premiere, but it is her ball.
Follow Marie Claire on Facebook for the latest celeb news, beauty tips, fascinating reads, livestream video, and more.
Marie Claire Newsletter
Celebrity news, beauty, fashion advice, and fascinating features, delivered straight to your inbox!

Alyssa Bailey is the news and strategy editor at ELLE.com, where she oversees coverage of celebrities and royals (particularly Meghan Markle and Kate Middleton). She previously held positions at InStyle and Cosmopolitan. When she's not working, she loves running around Central Park, making people take #ootd pics of her, and exploring New York City.
-
One of King Charles’ Siblings Was Adamant That Prince Harry and Meghan Markle Be Evicted from Frogmore Cottage
Meanwhile, another sibling was “uneasy” about the decision.
By Rachel Burchfield
-
Despite the Royal Family’s Disdain for Princess Diana When She Was Alive, It Regularly Pushed Both Kate Middleton and Meghan Markle to Dress Like Her, New Book Claims
“During the past 13 years, Diana cosplay has become a royal staple.”
By Rachel Burchfield
-
King Charles Employs 28 Personal Household Staff Members That Have to Do Some Really Weird Job Duties
Talk about “other duties as assigned.”
By Rachel Burchfield
-
The 28 Most Iconic Fashion Films, According to Marie Claire Editors
When your closet and your movie queue need a refresh.
By Katie Attardo
-
Red Club X Cartier Is Offering Invaluable Support for the Next Generation of Entrepreneurs
"The best way to predict the future is to create it."
By Sara Holzman
-
Yara Shahidi Joins Forces With Cartier Women's Initiative to Empower Entrepreneurs
"Giving back is essential to existing in the world."
By Sara Holzman
-
Fashion Test Drive: Chloe's Top-Handle Penelope Bag
This eye-catching bag also does good for the planet.
By Sara Holzman
-
Mindy Kaling's Custom Jonathan Simkhai Gown Is a Nod to Chanel Couture
"I feel so confident in this gown."
By Sara Holzman
-
Fashion Test Drive: Isabel Marant's Oskan Moon Bag
"The key word is versatility."
By Sara Holzman
-
What I Wear to Work: Poppy Harlow
The CNN host's key to a great wardrobe? Borrowing from her stylish friends.
By Sara Holzman
-
The Making of Ariana DeBose's Custom Versace Gown
"When I first saw it, I was left speechless."
By Sara Holzman