Lily James rivaled her iconic Cinderella dress in a major way, showcasing a silky blue Hellessy dress and serving ocean glamour realness. Is she a mermaid? Perhaps. The actress stepped out with boyfriend Matt Smith for an evening of entertainment at the Dunhill & GQ pre-BAFTA Filmmakers Dinner, pairing her fluid dress with strappy sandals, a velvet clutch, and her undeniable charm. Whether you're in the market for her actual dress or a silky ensemble similar to it, read on for help emulating her look.