Fashion Stars Wearing Stars By InStyle Editors InStyle Editors Instagram Twitter InStyle's mantra is "Everybody's in," and that means anyone who finds their way to our stories should find themselves reflected in them. We prioritize bringing the right writer to every story and sometimes collaborate as a team to ensure we're including points of view across race, gender expression, body size, skin and hair type, and more. 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. For more about our team, click here. InStyle's editorial guidelines Updated on June 20, 2008 @ 10:24AM Pin Share Tweet Email Photo: Doug Meszler/SplashNewsOnline.com Stars Wearing Stars 01 of 08 Kate Bosworth in Twenty8Twelve Humberto Carreno/Startraks Bosworth layered a tuxedo jacket by Sienna and Savannah Miller over a floaty Chloe dress. Flattered as she must be to have Bosworth in her design, Sienna's ideal model is her pal Keira Knightley. "She's the face of Chanel, so she's not likely to come and do my line," the actress has said. "But she's my mate so hopefully I would get mate's rates." GET KATE'S JACKET ONLINE NOWTwenty8Twelve cutaway jacket, $455; at saksfifthavenue.com. 02 of 08 Reese Witherspoon in L.A.M.B. Kevin Winter/Getty Images Gwen Stefani has inspired millions with her style, so it was no surprise to see Witherspoon working a L.A.M.B. dress at the recent Idol Gives Back. Other celebrities to don Gwen's designs include Cameron Diaz, Sophia Bush and Carrie Underwood. 03 of 08 Christina Ricci in The Row Junko Kimura/Getty Images Ricci brought some va-va-va-voom to Japan in a slinky green dress from The Row, designed by Mary-Kate and Ashley Olsen. The line of luxury basics has also been worn by Gwyneth Paltrow, Katie Holmes and Ellen Pompeo. 04 of 08 Carrie Underwood in Elizabeth and James Ray Tamarra/Getty Images Two sisters, two lines: Elizabeth and James follows The Row in Mary-Kate and Ashley Olsen's fashion empire. Country superstar Underwood wore a vintage-inspired sequined dress from the youthful line for New Year's Eve in Times Square. Natalie Portman, Heidi Klum and Mandy Moore have also been spotted wearing the label. 05 of 08 Paris and Nicky Hilton in DCMA Jeff Vespa/WireImage Paris Hilton may be a little biased when it comes to the DCMA line-she's dating co-designer (and Good Charlotte rocker) Benji Madden. "They work with some of the most amazing graffiti artists to make these really cool T-shirts that no one really has," she told US at the line's recent store opening. GET PARIS AND NICKY'S HOODIES NOWDCMA black or white patterned hooded sweatshirts, $65/each; at dcmastore.com. 06 of 08 Kate Beckinsale in DVB Marcos Vasquez/Ramey Photo Being a pal of Posh has its benefits-Beckinsale was spotted visiting a photography exhibit in flares from Victoria Beckham's DVB label. Eva Longoria and Jennifer Lopez have also worn the line. GET KATE'S JEANS NOWDVB flared jeans, $242; at saksfifthavenue.com. 07 of 08 Victoria Beckham in Chloe Sevigny "I hope there is something in the line that appeals to any and every kind of girl," Chloe Sevigny has said of her designs for Opening Ceremony. Indeed, Victoria Beckham looked absolutely flawless in the Big Love star's high-waisted skirt. 08 of 08 Amy Adams in Jovovich-Hawk Doug Meszler/SplashNewsOnline.com Actress, model and new mom Milla Jovovich knows pretty. So it's no surprise that her vintage-inspired Jovovich-Hawk line (designed with partner Carmen Hawk) has earned celebrity fans like Kirsten Dunst, Joy Bryant and Amy Adams. GET AMY'S DRESS NOWJovovich-Hawk smock dress, $540; at net-a-porter.com.