Best Dressed of the Week: Liv Tyler, Sienna Miller, More

From the humming New York social calendar to fashion shows in London, this was a big week for the best dressed list.

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Liv Tyler on the red carpet at the New York City Ballet.
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The fall social calendar kicked into high gear this week, from fashion week events in London to the opening of the City Ballet's fall season. Here, Liv Tyler sports a clasic black evening gown to support to City Ballet's first week of performances.
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Stella McCartney may be UK-born, but the designer turned out to show some support for the New York City Ballet clad in a bow-embellished black cocktail dress of her own design.
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The RxART party in NYC attracted fashion and pop culture personalities alike. Here, Cynthia Rowley sports a gold-embroidered cocktail dress with matching metallic kicks.
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Co-chair Jen Brill sported a smart white cocktail dress with a high mock collar to the event.
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Also at RxART, socialite Poppy Delavigne donned a navy beaded number styled with practical black wedges.
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Daphne Guinness made a cameo at the launch party of Mick Jagger's rock 'n' roll creation, "Super Heavy," clad in a Queen of Hearts ensemble of red and black stripes.
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London was in full Fashion Week mode this week, and Anna Wintour looked pitch-perfect as usual in one of her signature print dresses and a black patent overcoat for Burberry's Spring '12 showing.
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The Burberry show is one of the crowning gems of London fashion week. No surprise, then, that stylist Rachel Zoe was in attendance wrapped in an appropriately British-looking plaid overcoat.
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Erin O'Connor tried a cool color-blocked look for Christopher Kane's catwalk presentation.
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Olivia Palermo made an appearance at Jaeger's spring show clad in a smart white tuxedo.
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The much-discussed Pippa Middleton took a front row seat at Alice Temperley in a lace-embellished white sheath dress.
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Transformers star Rosie Huntington-Whitely hit the Burberry show in a pair of showstopper leather leggings and a burnt orange blazer.
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Front row frequenter Sienna Miller was also in attendance carrying a cool yellow-and-gray striped satchel.
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Actress Tilda Swinton showed off her quirky good taste in an exaggerated argyle vest at Pringle of Scotland.
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Franca Sozzani of VOGUE Italia looked casually chic in a polka-dotted sundress at the Ermanno Scervino show in Milan.
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