Our PicksBest and Worst Dressed of the WeekThe Fashion Beast Team12.06.13Our PicksBest and Worst Dressed of the WeekKeira Knightley re-wears her wedding dress, Marion Cotillard is a lady in Dior, and Lady Gaga channels her inner-Disney princess. Plus, more best and worst dressed of the week.The Fashion Beast Team12.06.13 7:20 PM ETGetty; WireImage; FilmMagic Keira Knightley re-wears her wedding dress, Marion Cotillard is a lady in Dior, and Lady Gaga channels her inner-Disney princess. Plus, more best and worst dressed of the week. David Atlan/VuittonBest Dressed, Black and Blue: Michelle WilliamsTo celebrate the Charlotte Perriand collaboration at Art Basel in Miami, Michelle Williams wore a black and blue Louis Vuitton dress. Dominique Charriau/GettyBest Dressed, Lady Dior: Marion CotillardMarion Cotillard, star of the "Lady Dior" campaign, attends the opening ceremony of the 13th Marrakesh International Film Festival on November 29 in a black and white polka-dotted gown by the designer topped with a sleek, side chignon. Monica Schipper/GettyBest Dressed, Flapper-Inspired: Shailene WoodleyActress Shailene Woodley sports a loose, black-and-white snakeskin halter dress from Calvin Klein's Spring/Summer 2014 collection to the 23rd annual Gotham Independent Film Awards on December 2. Neil P. Mockford/FilmMagicBest Dressed, Playgirl: Kate MossTo celebrate her upcoming cover for Playboy's 60th anniversary issue, Kate Moss arrives at Bookmarc in London on December 2 wearing a shimmering little black dress and a black-and-white striped, rabbit-fur coat, both by Marc Jacobs. She pairs her ensemble with black, pointed Christian Louboutin heels—aptly named ‘So Kate’ after the model. Cindy Ord/Getty for Autism SpeaksBest Dressed, Belle of the Ball: Allison WilliamsElegant, as usual, actress Allison Williams attends the Winter Ball for Autism at the Metropolitan Museum of Art on December 2 in a black gown with a lace bodice and tulle skirt and carries a black clutch, both by Oscar de la Renta. Stuart C. Wilson/GettyBest Dressed, Third Times the Charm: Keira KnightleyLeave it to Keira Knightley to pull off wearing her wedding dress three separate times. The actress attends the SeriousFun London Gala on December 3 wearing the same white vintage Chanel she wore when tying the knot in May. Paul Zimmerman/WireImageBest Dressed, Lady in Red: Lea MicheleLea Michele looks chic in a long-sleeved, red-lace Dolce & Gabbana dress with Swarovski crystals and Christian Louboutin heels at L'Oreal Paris's Women of Worth event on December 3. Ilya S. Savenok/GettyBest Dressed, Thigh-High: Gabrielle UnionActress Gabrielle Union attends the 2013 Alvin Ailey American Dance Theater's opening night benefit gala on December 4 sporting an emerald green, strapless Prada gown with a thigh-high slit and a large diamond necklace. Jun Sato/WireImageWorst Dressed, Disney Princess: Lady GagaIn one of her less outrageous ensembles, Lady Gaga walks through the Narita International Airport on December 3 wearing a simple white tee, black platform boots, and pants printed with, of course, the faces of Disney princesses. Stephen Lovekin/Getty for UNICEFWorst Dressed, Eastern Influence: Katy PerryAfter last week's Geisha fiasco, you'd think Katy Perry would stay away from ethnically-influenced ensembles. But, the singer arrived at the Ninth Annual UNICEF Snowflake Ball on December 3 wearing an Indian-inspired red velvet halter dress and a deep red cape with gold embroidery by Naeem Khan.