Sienna Miller has really stepped up her game this year with her cool and classic style that always creates new trends everyone wants to wear. She brought back the Bridget Jones pants at the American Sniper Premiere, opting for a Balenciaga dress which revealed the big undies under a beautiful off the shoulder winter white gown. She pulled off the knit fabric style effortlessly wearing simple and quirky pieces such as this fab striped rib dress by Celine with some chunky black strap heels by Pierre Hardy. Finally Sienna shows some diversity in her fashion by looking rock n roll in January, wearing a thigh high split dress with gold glamour polka dot patterning. With her retro Bardot looks, Sienna always pulls off those cool chic beauty styles such as red hot lips, full eyelashes and a little liquid eyeliner, but this years she mixed it up in Cannes with a burgundy lippy for a gothic look to match her black chiffon dress. To finish off the Sienna look, add some summery bronzer and always opt for natural earthy eyeshadows such as shimmering brown tones and creams.