Sienna Miller poses at the BMW event London - Arab Today British starlet Sienna Miller opted for a 1950s style as she attended the BMW i3 launch party in London on Monday. The actress looked gorgeous in a floral printed Dolce & Gabbana dress, paired with strappy Charlotte Olympia sandals and a set of chandelier earrings. Posing for pictures alongside fellow actor James Franco, the mum-of-one completed her look with tousled beach waves and a sunkissed glow.