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

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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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.

Anita Bugge/WireImage via Getty

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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.

Fernanda Calfat/Getty

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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.

Astrid Stawiarz/Getty

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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.

Frederick M. Brown/Getty

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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.

Ben Gabbe/Getty

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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?

Capital Pictures/Sipa USA

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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!

Charles Sykes/AP

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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.

Splash News

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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!

Bob Levey/Getty

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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.

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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.

The Fashion Beast Team