At the 2025 Met Gala, Hailey Bieber embraced the theme "Superfine: Tailoring Black Style" with a chic Saint Laurent black blazer minidress featuring structured shoulders and a pocket square. She paired the look with glossy black platform mules, sheer stockings, and accessorized with Tiffany & Co. diamond jewelry, including a necklace with a central stone over 25 carats. Her hair was styled in loose waves, and she attended the event solo, as her husband Justin Bieber was absent.