For Sienna Miller, being a fashion icon comes from taking chances.

“I don’t define style,” the GI Joe: The Rise Of The Cobra star, 27, tells me. “I don’t think there’s any definition. I suppose ‘just dress for yourself and not for anyone else’ is probably the best thing. I look ridiculous sometimes, but if I feel happy in it, then that’s all that matters.”

The New York-born, Brit-bred actress isn’t afraid to shop second-hand, and picks up pieces from L.A. vintage shop The Way We Wore.

Fashionistas can get her look for less. Upscale vintage designer clothier Decadestwo sold the Marchesa dress she wore for the 2007 Golden Globes. Not the one she actually wore, but one just like it.

For a How To Live Like feature on Sienna Miller, pick up the OK! on newsstands now. Jessica Simpson/Nick Lachey:
I Still Love Nick is the cover line.

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