Our Picks From Lady Gaga to Ciara, Best and Worst Dressed of the Week (PHOTOS)The Fashion Beast Team11.01.13Our Picks From Lady Gaga to Ciara, Best and Worst Dressed of the Week (PHOTOS)Natalie Portman stuns in Dior, Allison Williams rocks a vibrant jacket, and more of this week's best and worst dressed.The Fashion Beast Team11.01.13 8:20 PM ETNatalie 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. Anita Bugge/WireImage via GettyBest Dressed, Vision in White: Natalie PortmanFor 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/GettyBest Dressed, Winning the LBD: Diane KrugerDiane 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/GettyBest Dressed, Pop of Color: Allison WilliamsGirls 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/GettyBest Dressed, Give Me a Smooch: Hailee SteinfeldKisses 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. Ben Gabbe/GettyBest Dressed, Hints of Floral: Kate BosworthKate 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. Capital Pictures/Sipa USAYou Decide, What's On Her Head?: Lady GagaIs 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/APWorst Dressed, Does She Have a Mirror?: Mariah CareySinger 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 NewsWorst Dressed, Almost Famous: Ke$haIs 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/GettyBest Dressed, Pulling an Angelina: CiaraCiara 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! TwitterWorst Dressed, Girl Gone Wild: Miley CyrusYes, 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.