Sienna Miller, 25, took off her clothes to act as a 'free-loving flower child' hippie girl for her new movie - and she even grew her hair out for the role!
One insider claims Sienna is 'perfect' for the part: "She is not shy when it comes to stripping off and it is little wonder."
"She has always been praised for her distinctive boho look and even without clothes, she pulls this off."
Source: Celebrity-Gossip