Fashion The Must-See Fashion Looks of the Week: Rihanna, Cara Delevingne, and More 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 26, 2017 @ 04:00PM Pin Share Tweet Email Trending Videos Photo: Karwai Tang/WireImage This week in summer fashion was jam-packed with party and premiere looks, and celebrities brought the heat. The Hollywood stars shined in their designs, and we were treated to a runway of effortlessly stylish pieces, including Cara Delevingne's latest (and arguably greatest) red carpet look. Count on Delevingne to turn any red carpet into a high fashion runway. While at the London premiere of her latest film Valerian and the City of a Thousand Planets, Delevingne stunned in a borrowed-from-the-boys suit (sans shirt, of course) and jaw-dropping accessories: a black headband, crystal-adorned sandals, and a scene-stealing crystal shoulder necklace. See some of our other favorites below to get your fix of fabulous fashion. 01 of 04 Rihanna Karwai Tang/WireImage Rihanna, Queen of Fashion and General Badassery, had our jaws dropping when she arrived at the London premiere of Valerian, wearing a red off-the-shoulder gown with a voluminous skirt. Glimmering Chopard jewelry (including, yes, a watch) completed her show-stopping look. 02 of 04 Priyanka Chopra Janet Mayer/Star Max/GC Images Priyanka Chopra is back at it again with the chic summer looks. While out in New York City, Chopra donned a pastel pink romper with flowing sleeves and a keyhole neckline, nude pumps, and on-trend round sunglasses. 03 of 04 Leighton Meester Alexander Tamargo/Getty Gossip Girl alum Leighton Meester wore the most perfect summer outfit to the Sunglass Hut Made for Summer event over the weekend. The actress wore an asymmetrical sleeve floral frock, strappy Giuseppe Zanotti sandals in a neighboring color, and a pair of hoop earrings. 04 of 04 Jamie Chung Dia Dipasupil/Getty Jamie Chung wowed at Entertainment Weekly's annual Comic-Con party in a high-sheen suit (sans top) by Marissa Webb. The actress's champagne ensemble included matching sandals, a mini top handle bag, and metallic drop earrings.