Hazel went '90s chic in a butterscotch yellow button-up lace shirtdress with black Mary Janes, while Danny sported a classic black tux to promote his cinematography work on Flag Day, a film featuring Katheryn Winnick, Sean Penn, Regina King, Josh Brolin and more.
Hazel and Danny weren't the only ones having a father-daughter moment on the red carpet, however. Sean Penn brought his 30-year-old daughter, Dylan Penn, to the same event, and she certainly didn't hold back with the glam. Dylan dressed to impress in a beautiful strapless Chanel gown with an embroidered belt and strappy black heels.
The two were also joined by 27-year-old Hopper Penn, who matched his dad in a classy black suit. "Last night was a dream," Dylan later raved on Instagram. "Thank you to everyone who made this possible! I am forever grateful."
Meanwhile, Jude Law and Sadie Frost's daughter, Iris Law, turned heads for the premiere of Wes Anderson's The French Dispatch. The 20-year-old model wore a stunning white Dior dress, completing the look with her new bleached blonde buzzcut and sparkly silver shoes.
"A dream come true to attend my first Cannes Red carpet with my @diormakeup family," Iris wrote on Instagram. "~* this dress @mariagraziachiuri wow."
Tilda Swinton and John Byrne's daughter, Honor Swinton Byrne, also made an appearance at Cannes, attending various events, including the Les Olympiades (Paris 13th District) screening. The 23-year-old actress held hands with her famous mom while posing for photographers on the red carpet in a black-and-white Chanel ensemble. "Pinch me," she captioned a pic of herself in the outfit on Instagram.
See more fierce and fabulous looks from the Cannes red carpet in the gallery below: