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Sienna Miller’s Top 5 Style Rules

2. Make the Red Carpet Memorable.
You won't often find Miller wearing basic black on the red carpet. Instead, she opts for scene-stealing dresses like this Valentino she wore to the designer's 45th anniversary party in 2007, a Stella McCartney gown she rocked at the UNESCO Charity Gala and the Pucci dress she wowed in at the Costume Institute Benefit Gala, both in 2010.