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 @ 01:17PM Pin Share Tweet Email Trending Videos Photo: Jason LaVeris/FilmMagic Looks of the Week 01 of 22 Rihanna Gregg DeGuire/WireImage At the first Diamond Ball, Rihanna gave Old Hollywood glamour a Rihanna-patented twist by styling her rose off-the-shoulder duchesse Zac Posen gown with Chopard diamonds (and rubellites and rubies), a diamond Repossi ear cuff, and a sultry vampy lip. 02 of 22 Hailee Steinfeld Keith Tsuji/Getty Images for Dior Hailee Steinfeld celebrated her 18th birthday with a front row seat at Dior's Esprit Dior Tokyo 2015 show in an exquisite embroidered off-white silk Dior Haute Couture dress, with iridescent Dior pumps. 03 of 22 Emily Blunt Andrew H. Walker/Getty Images for DIFF Emily Blunt graced the IWC Filmmakers Awards at the 11th Annual Dubai International Film Festival in a sweeping forest-green lace Lanvin creation, complete with stone earrings and an IWC timepiece. 04 of 22 Diane Kruger Venturelli/Getty Images Diane Kruger stepped out in a beautiful white fit-and-flared beaded Chanel Couture design that she styled with H. Stern diamond earrings, a chain Chanel purse, and nude strappy sandals. 05 of 22 Kate Bosworth Jason LaVeris/FilmMagic Kate Bosworth hit the Coach Backstage Rodeo Drive in a cheery zip-up tangerine leather Coach mod dress, adding a touch of luxe with a metallic Kotur clutch and a quirky edge with chunky Coach clogs. 06 of 22 Emma Roberts Gary Gershoff/WireImage Emma Roberts took her front row seat at Valentino's first couture show in New York City in a flirty pink Valentino frock with a playful floral collar, complete with a studded plum clutch and tan ankle-strap pumps. 07 of 22 Olivia Munn Dimitrios Kambouris/Getty Images Olivia Munn lit up the Valentino couture fashion show in a cheery citrus-hued Valentino number that she styled with Melissa Kaye Jewelry earrings, rings by Jamie Wolf and EFFY Jewelry, a printed Valentino clutch, and studded tan Valentino pumps. 08 of 22 Olga Kurylenko Gareth Cattermole/Getty Images for DIFF Olga Kurylenko worked her curves at the 11th Annual Dubai International Film Festival Opening Night Gala in a stunning pale gray sheer tulle Ralph & Russo Couture gown embellished with pearls and crystals, complete with drop earrings. 09 of 22 Jaime King Gary Gershoff/WireImage Jaime King struck a pose at the Valentino Sala Bianca 945 event in a strapless pink-and-maroon color-block Valentino floor-length design, pairing it with drop earrings and stacks of bangles on each wrist. 10 of 22 Reese Witherspoon Jason LaVeris/FilmMagic Reese Witherspoon's look turn a sweet turn at the Inherent Vice premiere in Hollywood -she selected a tailored pink sheath dress that she styled with a matching pale pink lip, a low-slung pony, and nude pumps. 11 of 22 Felicity Jones Tim P. Whitby/Getty Images Felicity Jones graced The Theory of Everything premiere in London in a gorgeous embroidered white silk Dior Haute Couture creation with an exaggerated voluminous skirt, impeccably styling it with Forevermark diamond drop earrings and metallic pink pumps. 12 of 22 December 9, 2014 MICHAEL SIMON/Startraksphoto The street style star got into the holiday spirit at the Piperlime holiday party in a gold-dipped Piperlime Collection knit that she layered over a high-shine sequined Milly skirt, styling the two with a sharp tuxedo jacket, a black clutch and ankle-strap heels. 13 of 22 Tessa Thompson Earl Gibson III/WireImage Tessa Thompson struck bold at the 46th NAACP Image Wards press conference in a violet-and-fuchsia paneled Alberta Ferretti design with orange sandals. 14 of 22 Amy Adams Charley Gallay/Getty Images Amy Adams struck elegance at the Big Eyes screening in a black lace Dolce & Gabbana sheath, complete with Graziela Gems earrings, an EF Collection ring, and patent black pumps. 15 of 22 Emily Blunt Andrew Toth/FilmMagic Emily Blunt got into character at the Into the Woods premiere in an enchanting rose-embroidered point d'esprit Dolce amp Gabbana design, complete with Lorraine Schwartz jewelry and netted Louboutins. 16 of 22 Anna Kendrick Taylor Hill/FilmMagic Anna Kendrick went for a minimalist look at the Into the Woods premiere in a stunning black-and-white silk georgette Narciso Rodriguez number that she elegantly styled with a custom black Kate Spade New York box clutch and sleek strands. 17 of 22 Miranda Kerr Jun Sato/GC Images Miranda Kerr proved how much of a stylish jet-setter she really is, landing at Tokyo's Narita International Airport in a graphic black-and-white print dress styled with a white coat draped over her shoulders, a hot pink bucket bag, and black over-the-knee Christian Louboutin boots. 18 of 22 Jessica Chastain Rob Kim/Getty Images for Giorgio Armani Jessica Chastain was positively radiant at the NYC premiere of A Most Violent Year in a red-hot custom Giorgio Armani wrap dress that she styled with a delicate gold pendant and strappy sandals. 19 of 22 Keira Knightley Karwai Tang/WireImage Keira Knightley shimmered at the Moet British Independent Film Awards in a metallic cloque Simone Rocha number with a playful marabou trim, complete with gray suede pumps. 20 of 22 Taylor Swift Tim P. Whitby/Getty Images Taylor Swift stood out at the Jingle Bell Ball in a red multicolor embroidered Sachin & Babi dress with black Charlotte Olympia sandals. 21 of 22 Rose Byrne Jim Spellman/WireImage Rose Byrne hit the world premiere of Annie in a colorfully embroidered lace Mary Katrantzou design, pairing the dress with black tights and black suede Stuart Weitzman pumps. 22 of 22 Sarah Hyland Jason LaVeris/FilmMagic Sarah Hyland hit the TrevorLIVE LA event in a multicolored beaded Dsquared2 dress, picking up on the graphic print's red accents with a ruby-red Rauwolf clutch and red Stuart Weitzman sandals.