Popsugar Fashion Celebrity Fashion Sienna Miller Met Gala Fashion Outfits Sienna Miller Has Been Owning the Met Gala For Over 10 Years 12 May 2018 by Lucy Kenny View On One Page Photo 10 of 10 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 10 Sienna with designer Christopher Bailey. Previous Next Start Slideshow Celebrity FashionBritish CelebritiesNostalgiaMet GalaStyle ProfileSienna Miller