Celebrity Best of Look of the Day 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 November 30, 2008 @ 10:17PM Pin Share Tweet Email Trending Videos Photo: Russ Einhorn/SplashNewsOnline.com; David Longengke/LFI Best of Look of the Day 01 of 11 Anne Hathaway John Shearer/WireImage; Stella Photography/Elevation This year Hathaway favored quirky feminine looks (courtesy of super-stylist Rachel Zoe) like her frilly Oscar de la Renta cocktail dress (left) and rose-red Marchesa gown (right). "If you're going to be glamorous, it has to be tempered with eccentricity so that it incorporates your own personality," the actress told In Style. "Dressing up is great, but you need a twist." 02 of 11 Charlize Theron Marc Susset-Lacroix/WireImage; Billy Farrell/Sipa Press In 2008, Theron was flawless in a covetable custom Dior gown (left) from John Galliano, who calls the star, "so involved and creative." Meanwhile, her figure-flattering downtime style (right) was proof of what stylist Becks Welch deems her "great eye" for clothes. 03 of 11 Katie Holmes Henry Lamb/BEImages; Charley Gallay/Getty Images Holmes set the styles this year in pulled-together ensembles from her favorite designers. "I've always been interested in fashion," she told In Style. "I grew up with stacks of magazines." Her style acumen-and her legs-were on display in both a Fay mini-trench (left) and a draped Alexander McQueen dress (right). 04 of 11 Kate Beckinsale Gegg DeGuire/WireImage; John Shearer/WireImage Beckinsale knows pretty! The British beauty played up her pink-and-white features in ruffled Prada (left) and a single-shoulder goddess gown from Derek Lam (right). 05 of 11 Rachel Bilson Jon Kopaloff/FilmMagic; Louise Barnsley/Pacific Coast News "I love to mix things up," Bilson has said of her signature style. "I love using basics as a canvas, combining them with vintage pieces or piling on accessories." The star was effortlessly eclectic in a vintage black dress and Martin Margiela boots (left) and a Monrow motorcycle jacket, paired with Seven For All Mankind jeans (right). 06 of 11 Lauren Conrad Raoul Gatchalian/Star Maz; Mathew Imaging/WireImaging When she's not wearing her own line, this year the Hills fashionista selected body-conscious pieces from brands like D&G (left). And the ever-stylish star didn't slack when it came to casual-she sported separates like a brilliant red skirt (right) from pal Whitney Port's line, Whitney Eve. 07 of 11 Eva Mendes Dimitrios Kambouris/WireImage; Kevin Winter/Getty Images This year Mendes was uniformly stunning on the red carpet, even though her style can range from edgy Calvin Klein Collection (left) to ultra-ladylike Bill Blass (right). As the actress told In Style, "I dress for my mood, and since I don't have just one mood, I don't have just one style." 08 of 11 Cameron Diaz Gilbert Flores/Celebrity Photo; Steve Granitz/WireImage Diaz legged it on the red carpet this year in minidresses from Zac Posen (left) and Missoni (right). But even when off-duty, the actress displayed her own brand of laidback chic. "I don't like overdone or being too put-together," Diaz told In Style. "I like casual chic. Eclectic style. I want to feel like I can go anywhere, whatever I'm wearing." 09 of 11 Angie Harmon Marsaili McGrath/Elevation Photos; Donato Sardella/WireImage The Women's Murder Club star knows timeless clothes. Harmon showcased her classic beauty in a signature red dress from Valentino (left) and little black dress, also from the label (right). 10 of 11 Jennifer Lopez INF; Jackson Lee/SplashNewsOnline.com Becoming the mother of twins didn't slow down Lopez's 2008 style. The superstar wore a Bensoni coat for an N.Y.C. stroll (left) and lavender Versace (right) for an after-dark event. 11 of 11 Nicole Richie Russ Einhorn/SplashNewsOnline.com; David Longengke/LFI Richie brought '60s chic to the red carpet this year. The newly-minted jewelry designer channeled Brigitte Bardot in a sequined Reem Acra gown (left) and had flower-child style in Missoni (right).