Ahna O’Reilly's Monique Lhuillier High-Low Floral-Embroidery Ball Gown

Who: Ahna O’Reilly wearing a Monique Lhuillier high-low floral-embroidery ball gown
Shop: Bergdorf Goodman $8,790
Where: ‘As I Lay Dying’ Cannes Film Festival Premiere

Credit: Getty