A night of cocktails and browsing Matthew’s collection went down a treat with Sienna and her pals as they celebrated the launch of Belvedere Pink Grapefruit, hosted by the designer at his Bruton Road store.
Sienna had pulled out all the stops for the fashionable affair in a stunning draped metallic frock by Matthew Williamson himself, and some fierce cage wedges - we're sure Matthew was suitably impressed by his friend's efforts. She also appeared to have had a slight hair makeover for the occasion, sporting a full fringe.
The British beauty was joined by her sister, and design partner, Savannah as well as a very stylish Twiggy, and it looks like the fashion pack more than enjoyed their night out, as they fooled around for a few photos.
By Hayley Spencer