Sienna Miller will be seen running around butt-naked with two male co-stars in her new film 'The Mysteries Of Pittsburgh'.The actress has stripped off for a spot of skinny-dipping alongside Peter Sarsgaard and Jon Foster, reports the Sun.American Beauty star Mena Suvari and the infamous Nick Nolte also star in the movie.'The Mysteries Of Pittsburgh' is a coming-of-age drama set in the 80s against the backdrop of Pittsburgh, Pennsylvania.Previously, Miller has stripped off for 'Factory Girl' and 'Layer Cake'.
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