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 July 25, 2013 @ 12:02PM Pin Share Tweet Email Trending Videos Photo: John P. De Graeve/Rex/Rex USA Looks of the Week 01 of 20 Emma Roberts Alban Wyters/ABACAPRESS.COM WHAT SHE WORE At the Atelier Versace show Roberts wowed in a cut-out one-sleeve mini that she amped up with silver accessories. 02 of 20 Mena Suvari Michel Dufour/WireImage WHAT SHE WORE Suvari lit up the Atelier Versace presentation in a sunny sleeveless sheath that she styled with black accessories and a gold watch. 03 of 20 Allison Williams Theo Wargo/Getty Images WHAT SHE WORE Williams' fluorescent floral satin Matthew Williamson dress took a spot in the limelight at the Nantucket Film Festival. She accessorized with a skinny bangle and subdued neutral pointy-toe pumps. 04 of 20 Gabrielle Union Sara De Boer/startraksphoto.com WHAT SHE WORE At the BET Awards, Union was a vision in an intricately beaded white sleeveless column. She kept accessories to a minimum, save for statement rings and metallic ankle-strap heels. 05 of 20 Selena Gomez Michael Simon/startraksphoto.com WHAT SHE WORE At the SiriusXM Studios in New York City, Selena Gomez promoted her new album Stars Dance in a pretty print DVF jumpsuit and white Aldo x Preen strappy heels. 06 of 20 Jennifer Lawrence Martin Bureaumartin Bureau/AFP/Getty Images WHAT SHE WORE Lawrence took a front row seat at the Christian Dior couture show in the label's pastel cropped lace top and asymmetrical pleated-one-striped trousers. She accessorized her bare-midriff look with sunnies and black pumps. 07 of 20 Sandra Bullock Don Arnold/WireImage WHAT SHE WORE Bullock struck a pose at The Heat photo call in a monochromatic look from Alberta Ferretti, breaking up the blue top and cropped pants with a black leather belt and L.A.M.B. strappies. 08 of 20 Olivia Palermo INFphoto.com WHAT SHE WORE Palermo went top to toe in Christian Dior, belting an ivory blazer over an iridescent organza skirt, complete with embellished cuffs, white clutch and black pumps. 09 of 20 In Chanel, 2013 Dominique Charriau/WireImage At the 2013 Chanel couture show in Paris, Stewart wore the label's iconic tweed jacket, teaming it with black short shorts, black moto gloves, black strappy Jean-Michel Cazabat heels, and strategically placed gunmetal bangles. 10 of 20 Milla Jovovich Pascal Le Segretain/Getty WHAT SHE WORE Jovovich was decked in Giorgio Armani, balancing the white wide-leg trousers with a cropped sea-green jacket. She topped it off with a multi-layered statement necklace, strappy heels and gold clutch. 11 of 20 Naomie Harris Jacopo Raule/FilmMagic WHAT SHE WORE At the Armani Prive show in Paris, Harris flashed a peek of midriff in the label's sleeveless top and black pencil skirt. She styled her look with strappy metallic heels. 12 of 20 Thandie Newton David M. Benett/Getty WHAT SHE WORE Human rights activist Newton accepted the 2013 Voice of A Woman Award at The Hospital Club in a colorful striped blouse and a sunny yellow pencil skirt. Dainty gold jewelry and glittery pointy-toe pumps served as the finishing touches. 13 of 20 Alexa Chung FameFlynet WHAT SHE WORE At the Bulgari cocktail party, Chung jazzed up a leather mini with a crisp white button-down by Christopher Kane that boasted embellished collar and cuffs, rendering accessories irrelevant. Black strappy low-heel pumps completed the look. 14 of 20 Olivia Palermo AKM-GSI WHAT SHE WORE Out and about in Paris, Olivia Palermo dressed up a little white skirt with a snow leopard blouse, a decorative belt, an electric-blue purse and neutral cut-out heels. 15 of 20 Lea Michele Jason Merritt/Getty WHAT SHE WORE Michele struck a pose in a V-neck black jumpsuit that she styled with black strappy heels and dainty gold jewelry. 16 of 20 Alessandra Ambrosio Giovanni C./Broadimage WHAT SHE WORE Ambrosio ran errands in a breezy white blouse tucked into a pair of pinstripe cutoffs, white sandals and a neon yellow Michael Michael Kors crossbody bag. 17 of 20 Milla Jovovich AKM-GSI WHAT SHE WORE At the Bulgari cocktail party, Jovovich donned a flirty black-and-white dress lined with teeny tiny zigzags. She accessorized with black sky-high pumps and a black clutch. 18 of 20 Julianne Hough PJB/SIPA WHAT SHE WORE At the Georges Hobeika couture show, Julianne Hough stunned in a plunging cobalt blue jumpsuit. She kept accessories to a minimum, save for a dark clutch and a silver ring. 19 of 20 Reese Witherspoon AKM-GSI WHAT SHE WORE Witherspoon was decked out in red, white and stripes. She paired a striped Splendid top with white jeans, a red bag and matching strappy sandals. 20 of 20 Petra Nemcova John P. De Graeve/Rex/Rex USA WHAT SHE WORE Nemcova flaunted her figure in a blue bodycon dress at the Elie Saab couture show, accenting her look with a blue beaded necklace, a blue-and-gold boxed clutch and matching strappy heels.