Last Night's Look: Hit or Miss?

Vote on this week's styles including Katy Perry, Fergie and more stars! You decide – are they fashionistas or flops?

  • SIENNA MILLER photo | Sienna Miller

Credit: Dave M. Benett/Getty

Updated: Saturday Mar 12, 2011 | 06:00 AM EST

SIENNA MILLER

The newly single star illuminates her Twenty8Twelve LBD with sparkling platinum shawl in celebration of West End's Flare Path in London.