WWW [The Daily Mail]- A flouncy skirt, strappy top and floppy hat usually give Sienna Miller her hippy chick look. This time, however, she managed it with a lot less.

In fact, save for a garland of daisies in her hair, Miss Miller captures the Swinging Sixties feel wearing absolutely nothing at all.

The 25-year-old actress is starring in the movie Hippie Hippie Shake, playing a free-loving flower child alongside American-born actress Margo Stilley and Cillian Murphy.

With filming already under way, Miss Miller has had to grow her hair long and dye it from blonde to brunette.

It is understood directors have also asked her to cut down on her exercise regime to develop a more rounded physique, in keeping with the less gym-honed women of the era.

And with so much bare flesh, it is to be hoped she is slapping on the suncream to avoid becoming burnt Sienna.

“She is not shy when it comes to stripping off and it is little wonder,” said an onlooker.

“She has always been praised for her distinctive boho look and even without clothes, she pulls this off.”

The movie, to be released next year, is based on the hedonistic memoirs of the Australian journalist Richard Neville.