Popsugar Fashion Sienna Miller Sienna Miller Christopher Kane Dress Tribeca Film Festival Sienna Miller Wears the Cutout Party Dress to Steam Up Your Summer Nights April 21, 2016 by Sarah Wasilak View On One Page Photo 11 of 13 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 11 Previous Next Start Slideshow Sienna MillerSpring FashionRed CarpetChristopher KaneSpringDressesShoppingGet The Look