Fashion Looks of the Week By InStyle Editors InStyle Editors Facebook Instagram Twitter Our editors and writers comprise decades of expertise across the beauty, fashion, lifestyle and wellness spaces in print and digital. We prioritize journalistic integrity, factual accuracy, and also having fun with every story we share. InStyle's editorial guidelines Updated on March 27, 2015 @ 11:36AM Pin Share Tweet Email Trending Videos Photo: NCP/Star Max/GC Images Looks of the Week 01 of 22 Naomie Harris David M. Benett/Getty Images Naomie Harris celebrated the launch of Virgin Atlantic's new Vivienne Westwood uniform collection by aptly wearing a silver-black floral jacquard Vivienne Westwood frock, along with Vita Fede jewelry. For a pop of color, she stepped into a pair of bright bubblegum pink Casadei pumps. 02 of 22 Keira Knightley Richard Young/Rex/REX USA Keira Knightley turned heads at the annual Serpentine Gallery Summer Party in an exquisite multicolored one-shoulder beaded-and-floral appliqued Chanel creation with a sheer white ground-grazing underlayer. 03 of 22 Jessica Alba AKM-GSI Jessica Alba stepped out in a sweeping navy floral print L.A.M.B. maxi dress, styling it with an oversize black cardigan, a forest green Lanvin shoulder bag, and black lace-ups. 04 of 22 Liv Tyler Elder Ordonez/INFphoto Liv Tyler was all smiles in a short-sleeve blue printed Proenza Schouler dress, complete with wayfarers and black stilettos. 05 of 22 Nicola Peltz Andreas Rentz/Getty Images Rising star Nicola Peltz walked the red carpet at the Transformers: Age of Extinction premiere in sexy white separates, slipping on a sheer lace Dolce & Gabbana midi-length skirt over a cut-out Stella McCartney bodysuit. Soft wavy tresses and nude pumps completed her look. 06 of 22 Kate Middleton Splash News and Pictures The Duchess of Cambridge was a lady in red as she stepped out for a charity trip in a scarlet belted shift pencil dress by the British label Goat. She elegantly styled her look with a silver timepiece, a gold minaudiere, and nude pumps. 07 of 22 Taylor Swift INFphoto Taylor Swift left the gym looking impossibly chic and refreshed in a white button-down that she tied in the front, pairing it with gray-and-white floral-print capris, her go-to Dolce & Gabbana handbag, and nude high-heel sandals. 08 of 22 Heidi Klum Splash News Heidi Klum was the very definition of laidback chic in an printed cream button-down that she teamed with inky skinnies. For her accessories, she went with aviators, a studded skinny belt, a caramel leather tote, and studded strappy heels. 09 of 22 Emma Roberts AKM-GSI Emma Roberts gave her floral mini an edgy twist, styling it with a knotted worn-in graphic tee complete with a red cross-body purse, oversize sunnies, and black ankle boots. 10 of 22 Jessica Alba AKM-GSI Jessica Alba pieced together a perfect summer look with two classics-she layered a denim jacket over a LWD and styled the two with a Capwell+Co collar necklace, a navy Max Mara tote, and nude Monique Lhuillier lace-ups. 11 of 22 Jamie Chung Splash News and Pictures Jamie Chung stepped out over the weekend in a pretty pale floral print wide-leg jumpsuit, styling it with a straw Panama hat, a white cross-body purse, ankle-strap sandals, and tortoiseshell sunnies. 12 of 22 January Jones John Shearer/Invision for Johnnie Walker and Brooks Brothers/AP Images January Jones attended the Mad Men cast and crew wrap party in a black Honor dress with white netted detailing and a floral bib-like collar. White strappy Sigerson Morrison heels served as her shoe of choice. 13 of 22 Gwen Stefani AKM-GSI There's no doubt that Gwen Stefani is one cool mom. She was out with her brood rocking a graphic tank and leather joggers, pairing them with L.A.M.B. wedged sneaks, a studded Christian Louboutin bowler bag, white shades, and her signature red lip. 14 of 22 Jamie Chung Splash News and Pictures Out and about in Los Angeles, Jamie Chung gave a ladylike look a casual twist by pairing a sleeveless chambray top with a pleated midi-length skirt, complete with a straw Panama hat. As for accessories, she took a walk on the wild side with a zebra print mini tote and cut-out sandals, both by Loeffler Randall, and tortoiseshell sunnies. 15 of 22 Keira Knightley Splash News Keira Knightley sweetened up in a floral lace dress washed in the palest of pinks and gave it a modern edge with gold mirrored pumps and a Chanel purse. 16 of 22 Alessandra Ambrosio Photo Rio News / Splash News Victoria's Secret model Alessandra Ambrosio traded her LBD for a little white one, selecting a lace high-neck long-sleeveValentino mini and sticking with a one-note color palette with a white Valentino purse, drop earrings, and ankle-strap sandals. 17 of 22 Keira Knightley ALM-GSI Keira Knightley struck gold at the Begin Again photocall in metallic threads; she wore a sheer embroidered floral-check Simone Rocha dress with mirrored Mary Janes. 18 of 22 Taylor Swift AKM-GSI Taylor Swift squeezed in another workout and was snapped leaving the gym in a bold floral-print button-down Reformation romper, cinching it at the waist with a brown belt. Suede goldenrod yellow Gucci pumps and her go-to Dolce & Gabbana tote completed her look. 19 of 22 Jessica Alba Splash News Jessica Alba took the casual-chic route and styled a pale textured maxi with a Bella Dahl shirt, a set of chandelier earrings, her forest green Lanvin shoulder bag, and cork platforms. 20 of 22 Gemma Arterton Lia Toby/WENN Gemma Arterton was red-hot at the Serpentine Gallery Summer Party in sexy Prabal Gurung separates-a boxy jacquard crop top and a matching ruffled asymmetric pencil. Aside from a pair of statement earrings, she continued to commit to the color scheme with siren-red sandals. 21 of 22 Pippa Middleton AKM-GSI Pippa Middleton added a playful dash of neon to her look with a navy printed dress with fluoro-yellow accents. She streamlined her look with delicate jewelry pieces and navy accessories. 22 of 22 Taylor Swift NCP/Star Max/GC Images Taylor Swift mixed things up and tried her hand at high-low fashion by pairing her lemon houndstooth-print Miu Miu sweater top with a flared mint green Topshop skirt, complete with her go-to Dolce & Gabbana tote, coral heels, and cat-eye shades.