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From Lady Gaga to Ciara, Best and Worst Dressed of the Week

Natalie Portman stuns in Dior, Allison Williams rocks a vibrant jacket, and more of this week's best and worst dressed.

Natalie Portman stuns in Dior, Allison Williams rocks a vibrant tangerie jacket, and Ke$ha channels the 70s... in a very bad way. Plus, more of this week's best and worst dressed.

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Best Dressed, Vision in White: Natalie Portman

For the Berlin premiere of Thor on October 27, Natalie Portman looked classic and elegant in a white, strapless silk gown styled with a black silk belt, clutch, and simple diamond earrings.

Fernanda Calfat/Getty

Best Dressed, Winning the LBD: Diane Kruger

Diane Kruger looked fitting at Chanel's Little Black Dress event in Sao Paolo wearing... a LBD by Chanel. The actress wore a strapless dress with embroidered flowers from the brand's Spring 2013 collection and a pair of Stuart Weitzman heels. 

Astrid Stawiarz/Getty

Best Dressed, Pop of Color: Allison Williams

Girls star Allison Williams sported a clean-cut, all-white ensemble to Marie Claire's Power Women Lunch on October 30. The actress paired her sleeveless top and trousers from Calvin Klein's Spring/Summer 2014 collection with a vibrant orange wool coat.

Frederick M. Brown/Getty

Best Dressed, Give Me a Smooch: Hailee Steinfeld

Kisses all around! In typical Hailee Steinfeld fashion, the young Hollywood actress killed the red carpet on October 28 for the premiere of Ender's Game in a one-sleeved white top featuring sequined red lips and simple black trousers and pumps, all by Saint Laurent. 

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Best Dressed, Hints of Floral: Kate Bosworth

Kate Bosworth attends the Big Sur premiere on October 28 in NYC wearing a black floor-length Christopher Kane gown with subtle yet feminine floral appliqués at the neck and waist.

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You Decide, What's On Her Head?: Lady Gaga

Is Gaga turning heads in a good or bad way? The singer wore a sleek, high-low black dress coat from Alexander McQueen's Pre-Fall 2013 collection. The knee-high leather boots and large handbag coordinate perfectly -- but is the eye-covering Philip Treacy hat a bit too Halloween for every day?

Charles Sykes/AP

Worst Dressed, Does She Have a Mirror?: Mariah Carey

Singer Mariah Carey took the stage at BET Networks' Black Girls Rock! on October 26 in an ill-fitting ensemble. The low-cut crop top and hip-hugging skirt showed way too much for comfort. Put it away, Mariah!

Splash News

Worst Dressed, Almost Famous: Ke$ha

Is Ke$ha trying to convince us she's Penny Lane from Almost Famous? Good try -- but the neon-pink paisley suit, rocket tee, and John Lennon-inspired glasses look like a seventies Halloween costume gone bad.

Bob Levey/Getty

Best Dressed, Pulling an Angelina: Ciara

Ciara arrived at The Hotel Derek in Houston, TX on October 28 wearing a cut-out, in too many places, dress. The exposed leg, middriff, and undercleavage -- put some clothes on, girl!

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Worst Dressed, Girl Gone Wild: Miley Cyrus

Yes, we know it's Halloween, but Miley Cyrus as rapper Lil Kim just gives us the creeps. The exposed boob, the nipple pasties, the fuschia-overload! Miley looks more like Hannah Montana gone raving.