Popsugar Fashion Celebrity Fashion Lily James in Blue Hellessy Dress One Look at Lily James's Silky Dress Will Convince You She's a Mermaid 19 February 2018 by Lucy Kenny Image Source: Getty / David M. Benett As POPSUGAR editors, we independently select and write about stuff we love and think you'll like too. If you buy a product we have recommended, we may receive affiliate commission, which in turn supports our work. Lily James rivalled her iconic Cinderella dress in a major way on Thursday, 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. Related: Lily James Snags Another Game of Thrones Hunk in Her New Film Lily James and Matt Smith Image Source: Getty / Mark Boland Lily James Image Source: Getty / David M. Benett Lily James and Matt Smith Image Source: Getty / Mark Boland Lily James and Matt Smith Image Source: Getty / Mark Boland Lily James Image Source: Getty / David M. Benett Hellessy Sigrid Asymmetric Dress Hellessy Sigrid Asymmetric Dress (£1,313) shopbop.com Evening Dresses from shopbop.com Buy Now Topshop Puff-Sleeve Wrap Dress by Boutique Topshop Puff-Sleeve Wrap Dress by Boutique (£89) Topshop Dresses from ist-track.com Buy Now Hellessy Draped Off-Shoulder Top Hellessy Draped Off-Shoulder Top (£923) Farfetch Longsleeve Tops from farfetch.com Buy Now Alexander Wang Straight Skirt Alexander Wang Straight Skirt (£292) Alexander Wang Skirts from farfetch.com Buy Now Aldo Madalene Velvet Platform Heeled Sandal Aldo Madalene Velvet Platform Heeled Sandal (£24) Aldo Platforms from asos.com Buy Now Peter Pilotto Satin Jacquard Asymmetric Blouse Peter Pilotto Satin Jacquard Asymmetric Blouse (£650) Peter Pilotto Longsleeve Tops from harrods.com Buy Now Tibi Delphina Printed Silk Skirt Tibi Delphina Printed Silk Skirt (£535) Tibi Skirts from stylebop.com Buy Now Coast Blue La Lune Velvet Bag Coast Blue La Lune Velvet Bag (£45) Next Clutches from next.co.uk Buy Now Celebrity FashionBritish CelebritiesShoppingLily JamesMatt SmithShopbop.comTopshopFarFetchAlexander WangASOS