Olivia Wilde's been busy on the campaign trail for what is tipped to be the blockbuster of the summer, Cowboys and Aliens, and the whole gang hit London for the UK premiere.
The actress swept up the red carpet at the O2 Arena with co-stars Daniel Craig and Harrison Ford, in a flowing polka-dot Gucci gown with demure neck-tie.
On first glance, the dress appeared dramatic, but conservative - until Olivia turned to the side to reveal completely sheer panelling.