Sienna Miller led the glamour pack on Tuesday night at the BFI Luminous Gala Dinner - living up to the bash's name by looking radiant in a stunning white cocktail dress.
The actress wowed at the fundraising event, which included dinner and an auction, to celebrate British film and British film talent. It is held to raise funds to ensure the future of the BFI National Archive, which aims to preserve the history and artefacts of British film and TV culture.
Sienna rocked up to number 8 Northumberland Avenue in the head-turning frock, which featured spaghetti straps and a slightly oversized tulip-style skirt. She accessorised simply with black stilettos and a chic, relaxed high bun.
Make up was kept to a minimum, and her complexion was fresh, youthful and dewy.
Other stars at the bash included Eliza Doolittle, Emilia Fox, Jonathan Ross and Richard E Grant.
What do you think Sienna's dress? White hot, or white not? Now for more Sienna...