Reese Witherspoon in Louis Vuitton

At the premiere of her new movie This Means War in London, Reese Witherspoon cemented her recent sizzling style transformation working a sparkling emerald green sequinned Louis Vuitton Pre-Fall 2012 dress. Worn previously in ivory and gold by Cate Blanchett, we're loving Reese's more sultry version of the It frock.