Best Dressed: Rosario Dawson, Kim Kardashian and More

Stars stepped out in fall-ready looks this week for glitzy premieres and openings.

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This week, eccentric songstress Katy Perry donned a printed Randi Rahm mini and purple Jimmy Choo heels for the Tokyo premiere of her "Part of Me" biopic.
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For the premiere of "Venuto al Mondo," bombshell Penelope Cruz paired a vintage scarlet Versace gown with matching platform sandals and a shimmery gold clutch.
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It was only a matter of time before Kim Kardashian got her hands on an emerald green velvet Gucci wrap dress with a plunging v-neckline. The reality star paired the look with strappy gold sandals and spidery lashes for a Midori promo in Santa Monica.
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At the premiere of "Pitch Perfect," Elizabeth Banks looked rather perfect herself in a structured black keyhole-cutout number and a shiny golden clutch.
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Emma Watson looked classically elegant at a screening of ''The Perks of Being the Wallflower' in a velvet black Dior Haute Couture dress with a simple sweetheart neckline and trim black trousers.
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At the launch of Tara Smith Vegan Haircare, Rosario Dawson looked eclectic and cool in a patchwork lace skirt, silky pink top and a statement necklace.
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Milla Jovovich looked her usual fierce self at the 2012 DreamBall Gala, to which she sported a reptile-print ballgown by Armani and dramatic, emerald green earrings.
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For a Cinema Society party, Olivia Wilde went for an elegant green printed caftan and silvery sandals.
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Rihanna went for an uncharacteristically relaxed look for the grand opening of the Barclay's center this week, clad in a printed white Acne pajamas ensemble and a glistening statement necklace.
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For "The Scenemakers" party at Chateau Marmont, Nikke Reed looked playfully chic in a flower-printed Dolce & Gabba shift dress and cream-colored pumps.
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Kiernan Shipka looked sweet and chic in a blue silk Opening Ceremony mini dress with a peter pan collar and turquoise suede kitten heels.
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At the Teen Vogue party, Ariel Winter looked fresh faced and stylish in a classic white sundress finished in tiny eyelet flowers.
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At the premiere of "Butter," "Twilight" alum Ashley Greene donned a slinky peach Donna Karan wrap dress and Casadei pointy suede pumps.
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At a charity event this week, Gabrielle Union looked totally fashion forward in a sassy coral-beaded Naeem Khan shift dress and sexy nude sandals.
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For the launch of her KMart collection, Sofia by Sofia Vergara, the "Modern Family" star went for an alluring metallic black mini-dress and a classic wool pea coat, which she accessorized with a sparkly gold cuff.
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