Our PicksBest & Worst Dressed of the WeekThe Fashion Beast Team01.24.14Our PicksBest & Worst Dressed of the WeekKeira Knightley rocked a little black dress, Lupita Nyong'o stunned in turquoise Gucci, and Kristin Chenoweth bared too much cleavage. Plus, more of fashion's highs and lows. The Fashion Beast Team01.24.14 11:29 PM ETGettyBest and Worst DressedKeira Knightley rocked a little black dress, Lupita Nyong'o stunned in turquoise Gucci, and Kristin Chenoweth bared too much cleavage. Plus, more best and worst dressed of the week. Anthony Harvey/GettyBest Dressed: Keira KnightleyKeira Knightley wore a black Proenza Schouler dress with a high-neck and subtle peplum to the London premiere of Jack Ryan: Shadow Recruit on January 20. She accessorized with black pumps (with a bowed ankle-strap) and a silver bow bracelet, both by Chanel. Pascal Le Segretain/GettyBest Dressed: Tilda SwintonTilda Swinton, the face of Chanel Pre-Fall 2013, sat front row at the brand's haute couture show on January 21 wearing a Pre-Fall 2013 look that consisted of a tan, star-printed cashmere sweater, a patterned knit skirt, white tights, simple black-and-white, two-toned heels, and an American flag scarf. Ethan Miller/GettyBest Dressed: Lupita Nyong'oFor the SAG Awards on January 18, Lupita Nyong'o was radiant in a floor-length turquoise dress with artistic floral embroidered straps and coordinating bright eye make-up. Ian Gavan/GettyBest Dressed: Naomi CampbellAlthough it's not Alaia, Naomi Campbell still stood out in a metallic, silver and nude giraffe print dress from Michael Kors's Resort 2014 collection. Pascal Le Segretain/GettyBest Dressed: Leelee SobieskiActress LeeLee Sobieski stunned while attending Dior's haute couture show on Monday in a silver and light blue jacquard dress, a loose grey coat, and bright blue pointed-toe pumps with a black ankle strap. Angela Weiss/GettyBest Dressed: Michelle DockeryPrada's Spring 2014 collection has been getting some serious face time recently, and the SAG Awards were no exception. Downton Abbey actress Michelle Dockery wore a green and black strapless mini-dress to the Entertainment Weekly Nominees party, clad with one of the brand's signature faces and a half rainbow. David Cardiff/WENN.comWorst Dressed: Ellie GouldingEllie Goulding must have been freezing to death when she stepped out in NYC on January 22 in an oversized mesh football-jersey-style shirt. The singer paired her Rebecca Minkoff top with black leggings, boots, and a beanie. Alberto E. Rodriguez/GettyWorst Dressed: Kristin ChennowethToo much cleavage and too little hair were Kristin Chenoweth's biggest issues at the Producer's Guild Awards. Her two-toned black and navy dress with a plunging neckline and ill-fitting waist was almost as bad as her latest haircut.