Style File: Sienna Miller

One of her best red carpet moments. Sienna looked stunning in a backless Matthew Williamson gown at the Baftas 2007. Credit: www.mydaily.co.uk

Sienna sparkled at the 2009 MTV Movie Awards in a Swarovski embellished mini dress from her own Twenty8Twelve collection. Credit: www.elle.com

Sienna Miller wowed in red Valentino gown at the 45th Valentino Anniversary celebration, back in July 2007. Credit: www.mydaily.co.uk

Miller dazzled in a low-cut Pucci gown on the red carpet with ex-partner Jude Law at the 2010 MET Ball. Credit: www.mydaily.co.uk

Sienna on the red carpet at the opening of the House of Esquire in LA. Here, opting for this navy cocktail dress over her usual basic black choice perfectly complimented her icy blue eyes. Credit: www.mydaily.co.uk

Even pregnant the starlet still manages to look effortlessly chic. Credit: Zimbio.com

Sienna’s off-duty style shows us how easy it is to pull off an edgy casual look. Credit: Zimbio.com

Sienna steps out dressed head-to-toe in black for a more elegant winter day look. Credit: Zimbio.com