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InStyle's editorial guidelines Updated on December 6, 2013 @ 01:15PM Pin Share Tweet Email Photo: Lisa Maree Williams/Getty Looks of the Week 01 of 22 Kate Middleton Anthony Harvey/Getty WHAT SHE WORE At the royal premiere of Mandela: Long Walk to Freedom, the Duchess slinked onto the red carpet in an ivory Roland Mouret column accented by a diamond necklace and black accessories. 02 of 22 Naomie Harris Jon Furniss/Invision/AP WHAT SHE WORE Harris struck the perfect note at the Mandela: Long Walk to Freedom premiere, walking the red carpet in a black strapless Alexander McQueen gown with gold-embroidered peplum detailing. Her only accessories were a pair of statement danglers and a ring. 03 of 22 Emmy Rossum Jim Smeal/BEImages WHAT SHE WORE At the August: Osage County screening, Rossum went the ladylike approach with a navy silk faille sequin-and-floral embroidered Oscar de la Renta A-line dress, styling it with geometric earrings, an embellished clutch and white Rupert Sanderson pumps. 04 of 22 Elizabeth Banks Jerod Harris/Getty WHAT SHE WORE Banks got in the holiday spirit at Legoland's tree lighting ceremony in a mixed-print flared Preen dress that she topped with a J Brand leather moto jacket, Jacob amp Co. jewelry and black ankle boots. 05 of 22 Gabrielle Union Michael Stewart/Getty WHAT SHE WORE At the Alvin Ailey Dance Theater's benefit gala, Gabrielle Union showed up in a strapless styled Prada gown in a rich shade of emerald green. A diamond wreath at her neck and black T-strap heels completed her look. 06 of 22 Sandra Bullock Masatoshi Okauchi/Rex/REX USA WHAT SHE WORE Bullock premiered Gravity in Tokyo in a strapless blue fit-and-flared Carolina Herrera dress with a floral-embroidered sheer hem, pairing it Martin Katz jewelry and black peep-toes. 07 of 22 Jessica Biel Jeffrey Mayer/WireImage WHAT SHE WORE Biel proved that the cropped trend is here to stay, wearing a black midriff-baring Giambattista Valli top and a black lace skirt. For added drama, she topped off her look with a leather jacket, a sparkly bracelet and black lace Bionda Castana pumps. 08 of 22 Amanda Seyfried Lee Young-ho/Sipa USA WHAT SHE WORE As the face of beauty brand Cle de Peau, Seyfried fulfilled her spokeswoman duties in South Korea in a graphic red-and-black A-line dress, complementing the two-toned color palette with a bold red lip and black pumps. 09 of 22 Keira Knightley David Fisher/Rex/REX USA WHAT SHE WORE At the 2013 SeriousFun London Gala, Keira Knightley styled her pretty tulle long-sleeve Chanel Couture wedding dress for the red carpet with gold strappy Jimmy Choo heels. 10 of 22 Angie Harmon Nancy Kaszerman/ZUMAPRESS.com WHAT SHE WORE At the Ninth Annual UNICEF Snowflake Ball, Harmon stunned in a strapless black-and-white ruffled Angel Sanchez gown, with Lorraine Schwartz jewels. 11 of 22 Lea Michele Fernanda Calfat/Getty WHAT SHE WORE Michele stole the spotlight at the L'Oreal Paris Women of Worth 2013 event in a red Dolce amp Gabbana dress embellished with Swarovski crystals, pairing it with classic Christian Louboutin pumps. 12 of 22 Amy Adams Kevin Winter/Getty WHAT SHE WORE Adams struck a pose at the American Hustle premiere in a black-and-white David Koma pencil dress with a sheer hem, accenting the dress with Neil Lane diamond jewelry and embellished black Christian Louboutin pumps. 13 of 22 Olivia Palermo Leandro Justen/BFANYC.com/BFAnyc/Sipa USA WHAT SHE WORE Palermo nailed the menswear trend, topping off her all-black ensemble with an optic-white tuxedo vest. But it was her accessories that shone bright: A stack of bangles, a bejeweled brooch, a Stuart Weitzman clutch embellished with jade gems, and snakeskin pumps. 14 of 22 Allison Williams Cindy Ord/Getty WHAT SHE WORE At the 2013 Autism Ball Allison Williams worked the blue carpet in a frothy black Oscar de la Renta creation, with a lace bodice and tiers of tulle for the skirt. Delicate drop earrings, a black clutch and bold red lip completed her look. 15 of 22 Lupita Nyong'o Kristina Bumphrey/Startraksphoto.com WHAT SHE WORE Nyong'o went in a girly direction at the Gotham Independent Film Awards, wearing a white strapless bow-adorned Lanvin tea-length dress with red Lanvin pumps. 16 of 22 Shailene Woodley Monica Schipper/Getty WHAT SHE WORE Woodley attended the 23rd Annual Gotham Independent Film Awards in white-and-black Calvin Klein Collection halter dress, simply styling it with nothing except for black ankle-strap heels. 17 of 22 Kate Middleton Mark Cuthbert/UK Press via Getty WHAT SHE WORE At the SportsBall, Duchess of Cambridge styled a black lace knee-length Temperley London dress with a bright red Alexander McQueen clutch and black Jimmy Choo pumps. 18 of 22 Marion Cotillard Dominique Charriau/Getty WHAT SHE WORE At the 13th Marrakech International Film Festival in Morocco, Cotillard attended the premiere of A Thousand Times Good Night in a tea-length Christian Dior dress with playful candy-colored stripes, pairing it with delicate ankle-strap Dior stilettos. 19 of 22 Alicia Keys Norman Ko / Splash News WHAT SHE WORE Keys lit up the 27th Annual ARIA Awards 2013 in a sunny Stella McCartney gown, complete with a gold belt and a chunky gold chain necklace. 20 of 22 Gwen Stefani EROTEME.CO.UK/BAUER-GRIFFIN.COM WHAT SHE WORE Who knew dog-walking could be so chic? Stefani wore cherry-red long-sleeve dress (to match her signature red lip) with black tights, knee-high boots and a black carryall. 21 of 22 Jessica Alba WENN.com WHAT SHE WORE On her way to The Honest Company offices, Jessica Alba was spotted in a laidback-cool look: A black moto jacket over a studded black top with printed pants and buckled boots. A cherry-red tote delivered a punch of color. 22 of 22 Kristen Wiig Lisa Maree Williams/Getty WHAT SHE WORE Instead of donning a dress, Wiig worked the Anchorman 2 premiere in an all-black Martin Grant jumpsuit, styling it with a black skinny belt, a gold Saint Laurent cuff and Christian Louboutin peep-toes. Was this page helpful? Thanks for your feedback! Tell us why! Other Submit