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May 31, 2009 at 9:08 pm

Sienna Miller - MTV Movie Awards 2009

Sienna Miller - MTV Movie Awards 2009

Sienna Miller sparkles in a backless green dress at the 2009 MTV Movie Awards held at the Gibson Amphitheatre on Sunday evening (May 31) in Universal City, Calif.

The 27-year-old actress wore a dress from her own collection, the Twenty8Twelve “Viviane” green Swarovski mini dress.

Hosted by Andy Samberg, the 2009 MTV Movie Awards will air live TONIGHT @ 9PM ET/PT on MTV. Viewers got an exclusive first look at her upcoming new movie, G.I. Joe: The Rise of Cobra. The clip was presented by Sienna and costar Channing Tatum.

10+ pictures inside of Sienna Miller @ the 2009 Movie Movie Awards…

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Photos: Jason Merritt/Getty

Posted to: MTV Movie Awards 2009, Sienna Miller