Celeb Fashion Hit or Miss?

Vote on this week's styles including Mary-Kate Olsen, Reese Witherspoon and more stars! You decide – are they fashionistas or flops?

01 of 44

MARY-KATE OLSEN

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Seth Browarnik/Startraks

The star gets into the tropical spirit in her turquoise trench, matching dress and Proenza Schouler booties at the opening of the Mondrian during Art Basel in Miami.

02 of 44

REESE WITHERSPOON

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Jeffrey Mayer/WireImage

The Four Christmases star suits up in black for the 18th Annual Los Angeles Beat the Odds dinner hosted by the Children’s Defense Fund.

03 of 44

HILARY DUFF

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Alexandra Wyman/WireImage

The star shows off her small waist in a bold Hervé Léger by Max Axria belt over a tiered gray skirt and black tank top with Avakian jewels at the grand opening of the SLS hotel in Los Angeles.

04 of 44

EVA MENDES

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Eamonn McCormack/WireImage

The Spirit star is a stand out in her yellow Bill Blass strapless dress, Bulgari jewels and Christian Louboutin heels at the film’s London premiere.

05 of 44

SCARLETT JOHANSSON

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Jon Furniss/WireImage

Mendes’s costar is a retro vision in her vintage floral dress, flowered Brian Atwood heels and Cartier jewels at The Spirit London premiere.

06 of 44

PARIS HILTON

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Jason Merritt/FilmMagic

The socialite sparkles in her sequined silver dress with matching Fendi purse and pumps at the grand opening of the SLS hotel in Los Angeles.

07 of 44

DIANE KRUGER

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Fame

The actress is a shimmery vision in her futuristic Chanel dress at a party for the brand in Paris.

08 of 44

KRISTEN BELL

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Mike Guastella/WireImage

The Heroes star flaunts her figure in a sky-blue Hervé Léger dress, Avakian jewels and Jimmy Choo heels at the jewelry designer’s Beverly Hills boutique celebration.

09 of 44

LILY ALLEN

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Fred Duval/FilmMagic

The British singer gets her plaid on in a high-waisted tartan number at the Target Women in Film Awards in London.

10 of 44

ROSARIO DAWSON

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Alexandra Wyman/WireImage

The actress sizzles in a red hot Shoshanna sheath dress and green heels at the SLS Hotel grand opening in Los Angeles.

11 of 44

KATE WINSLET

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Evan Agostini/AP

The actress sizzles at the N.Y.C. premiere of her film The Reader in a gray Hervé Léger bandage dress, Fred Leighton jewels and sexy silver Roger Vivier sandals.

12 of 44

CHRISTINA AGUILERA

CHRISTINA AGUILERA
Scott Kirkland/INF

Looking like a real-life bronze goddess, the singer heads to the Grammy nominations concert in an elegant strapless, metallic gown by Monique Lhuillier with her hair in a chic chignon.

13 of 44

TAYLOR SWIFT

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Matt Sayles/AP

Showing off her signature look on the Grammy nominations concert red carpet, the singer pairs a lilac one-shoulder Jay Godfrey dress with silver peep-toe platforms.

14 of 44

MARY-KATE OLSEN

MARY-KATE OLSEN
Ralph Notaro/Splash News

The actress hits her hippie stride in a loose crushed velvet jacket, flared trousers and a feathered hat in Miami Beach.

15 of 44

LUCY LIU

LUCY LIU
Demis Maryannakis/Splash News

The Dirty Sexy Money star makes winter look inviting, dazzling at the UNICEF Snowflake ball in a draped sky blue gown with glimmering chain straps and a feathered Roger Vivier clutch.

16 of 44

NICOLE KIDMAN

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Camilla Morandi/Corbis

Another premiere, another chic dress! The Australia star continues her whirlwind tour in a ’40s-inspired LBD at the film’s Rome screening.

17 of 44

DEBRA MESSING

DEBRA MESSING
Juan Rico/Fame

The actress wraps herself up in an elegant ruched Donna Karan frock, flower-topped peep-toe pumps and Bulgari jewels for the Nothing Like the Holidays premiere in L.A.

18 of 44

JESSICA ALBA

JESSICA ALBA
Stefania D'Alessandro/WireImage

The actress shows off an avant-garde silhouette at the Campari Club Calendar launch in Milan in a lipstick-red Dolce & Gabbana dress, platforms and dazzling Bulgari jewels

19 of 44

NICOLE KIDMAN

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Carlos Alvarez/Getty

The Australia star goes for the gold in her glimmering lamé Prada sheath and shoes at the film’s Madrid premiere.

20 of 44

MICHELLE WILLIAMS

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Evan Agostini/AP

Looking chic in a classic Balenciaga LBD at the Gotham Independent Film Awards in N.Y.C, the actress adds a touch of dazzle with a brooch at her shoulder.

21 of 44

TAYLOR MOMSEN

TAYLOR MOMSEN
Neilson Barnard/Getty

It’s only rock ‘n’ roll but the Gossip Girl star shows she likes likes it, wearing an edgy black chiffon dress covered in silver sequins and diamante-encrusted shoes for a Rock and Roll Hall of Fame event in N.Y.C.

22 of 44

AMY ADAMS

AMY ADAMS
ST/Splash News

Talk about enchanting! Adams shows off her feminine side, pairing a black and gold beaded organza Carolina Herrera gown and black Mary Jane heels with a VBH clutch at the Independent Film Awards red carpet in N.Y.C.

23 of 44

SCARLETT JOHANSSON

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Fotonoticias/WireImage

The newlywed mixes it up, pairing her patterned miniskirt with a lacy high-necked top – both from Stella McCartney – accessorized with Christian Louboutin heels and Van Cleef and Arpels jewels at a cocktail event for her movie The Spirit in Madrid.

24 of 44

HEIDI KLUM

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Dara Kushner/INF

The Victoria’s Secret supermodel exits a store opening event in New York in a red and black YAYA AFLALO strapless mini and peep-toe pumps.

25 of 44

EVA MENDES

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ENF/Fame

The actress is elegant in her retro-inspired, off-the-shoulder Luisa Beccaria cocktail dress, Stella McCartney heels and Bulgari jewels for a party celebrating her film The Spirit in Madrid.

26 of 44

RACHEL WEISZ

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Evan Agostini/AP

Proving she’s earned her fashionista stripes, the actress heads to the Independent Film awards in a chic asymmetrical black and white Narciso Rodriguez frock – and bright ruby lips.

27 of 44

BEYONCé

BEYONCé
Dimitrios Kambouris/WireImage

She might not be channeling her alter ego, “Sasha,” but the star still looks fierce in her beaded Zuhair Murad gown, complete with a train and bouffant do, for the premiere of her new movie Cadillac Records in New York City.

28 of 44

NICOLE KIDMAN

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Maxppp /Landov

With her Sexiest Man Alive by her side, the star glitters in a belted Dries van Noten coat dress and Pierre Hardy shoes for the Parisian premiere of Australia.

29 of 44

EVA MENDES

EVA MENDES
Sergio Perez /Landov

The star is pretty in pink in her sweet belted Bill Blass sheath, C. Greene earrings and patent Stella McCartney stilettos – topped off with new bangs – for the Madrid photo call of The Spirit.

30 of 44

KIM KARDASHIAN

KIM KARDASHIAN
Gabriela Maj/Getty

Showing off new blunt bangs, the reality star is girly in her ruffled frock and peep-toe Louboutins at the Hearst Magazines/A Diamond is Forever Empowerment for Africa dinner in N.Y.C.

31 of 44

PENéLOPE CRUZ

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Hector Vallenilla/Pacific Coast New

The star brings a European flair in her chic Chanel suit and black brimmed bowler for a World AIDS Day ribbon cutting ceremony in New York City.

32 of 44

SCARLETT JOHANSSON

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Sergio Perez /Landov

The newlywed shows off new honey-colored locks and the menswear trend in a 3.1 Phillip Lim satin blazer and pants and Louboutin heels for The Spirit photo call in Madrid.

33 of 44

KERRY WASHINGTON

KERRY WASHINGTON
Axelle/Bauer-Griffin

The actress goes retro in a belted, mod-print Missoni jumpsuit, diamond bangles and blunt bangs at the Cinematheque Awards in Los Angeles.

34 of 44

GABRIELLE UNION

GABRIELLE UNION
Charles Eshelman/FilmMagic

Making a glam appearance in a black and gold Tadashi Shoji gown and Kara Ross jewels, the actress steals the show at the Cadillac Records premiere in New York City.

35 of 44

EVA LONGORIA PARKER

EVA LONGORIA PARKER
Flynet

The star sizzles at pal Roselyn Sanchez’s wedding in Puerto Rico in a zebra-print Naeem Khan gown and H.Stern jewels.

36 of 44

VICTORIA BECKHAM

VICTORIA BECKHAM
Ray Tamarra/Getty

While spending time with the Cruise family, the star suits up in all white – down to her fedora – while out and about with her own brood in N.Y.C.

37 of 44

BRITNEY SPEARS

BRITNEY SPEARS
Ramey

The birthday girl gives her fans a big smile as she leaves a French TV station in a toggle coat, skinny jeans and a red tote.

38 of 44

DEMI MOORE

DEMI MOORE
Jon Furniss/WireImage

The actress is Flawless in black and white Chanel at the London premiere of the film.

39 of 44

SIENNA MILLER

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Jon Furniss/WireImage

The actress shows off her legs in a jeweled Louis Vuitton minidress at the British Independent Film Awards in London.

40 of 44

KEIRA KNIGHTLEY

KEIRA KNIGHTLEY
Gotcha Images / Splash News

Also at the British Independent Film Awards, Miller’s The Edge of Love costar is lovely in a feminine black and white Balenciaga frock with a full skirt.

41 of 44

DIANE KRUGER

DIANE KRUGER
A-way!/ Splash News

The actress is simply elegant in her one-sleeve ivory satin Chanel gown, vintage Fred Leighton earrings, Jaeger Le Coultre watch and Jimmy Choo heels at the Bambi Awards in Germany.

42 of 44

ASHLEY TISDALE

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INF

The High School Musical 3 star keeps it simple, accenting her all-black look with thigh-high boots and a Fendi purse as she goes shopping with Vanessa Hudgens (not pictured) in Los Angeles.

43 of 44

PARIS HILTON

PARIS HILTON
Charles Sykes/AP

The heiress makes an appearance for her latest perfume in a teal satin Yoana Baraschi dress and big curls at the Macy’s in Woodbridge, N.J.

44 of 44

SHENAE GRIMES

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George Pimentel/WireImage

The 90210 actress is chic in a graphic Yoana Baraschi minidress cinched with an Elizabeth and James belt and thigh-high boots at the Gemini Awards in Toronto.

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