Olivia Wilde

Ferdaus Shamim/WireImage.com

How do you shake up a so-so summer movie promotional tour?

Show some skin, natch.

That's what sexy star Olivia Wilde decided to do at the Cowboys & Aliens premiere in London yesterday...

Olivia Wilde

Ian Gavan/Getty Images

The 27-year-old actress busted out a whole lot of side boob when she went braless in a sheer, long-sleeve Gucci polka-dot gown with contrasting pussy bow, Brian Atwood pumps, bright red lips and nails and Bump-It-esque hair.

Of course Olivia had to show some skin in this otherwise prim, prairie-style dress, but is it too much side cleavage?

Check out the close-up snap and then weigh in below!

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