Sienna Miller Wears Tight Leather outfit for new GI Joe Movie

Sultry Sienna Miller is sure to set pulses racing dressed in a skin-tight leather catsuit.

But rest assured, the outfit isn't just for boyfriend Rhys Ifans' viewing pleasure.

The stunning actress hams it up in the bondage-style outfit, complete with sunglasses and dark hair as part of her new action movie G.I Joe.

And while it's not known what Ifans thinks of her new look, there's little doubt it has already caused quite a hit with her legions of male fans.

The normally sweet-looking 26-year-old has forgone her nicer side to play gun-toting femme fatal The Baroness, in the blockbuster film, which is due to be released next year.

The 26-year-old plays an intelligence officer for evil arms dealing organisation COBRA.

Her character, based on the classic army comic strip, is an evil but sexy woman with a production insider telling the Sun: "Sienna has had a lot of fun with the movie."

The actress is a force to be reckoned with, and below, a more demurely dressed and blonde Sienna with boyfriend Ryhs Ifans