Celeb Fashion Hit or Miss?

Vote on this week's styles including Sienna Miller, Julia Roberts and more stars! You decide – are they fashionistas or flops? By Melissa Liebling-Goldberg

01 of 49

SIENNA MILLER

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Ramey

The Edge of Love star keeps it simple in a full-skirted red vintage Dior dress and black accessories for a private screening of the film in London.

02 of 49

JULIA ROBERTS

JULIA ROBERTS
CB/Splash News

Even oversized glasses can’t hide her star power! The shady lady makes her way down the Kit Kittredge: An American Girl red carpet in jeans and a black cardian.

03 of 49

KEIRA KNIGHTLEY

KEIRA KNIGHTLEY
PA Photos /Landov

The Edge of Love star may show off her singing in the movie, but her red carpet prowess is hard to miss in this pleated purple Erdem dress, Moschino heels and Van Cleef & Arpels jewels at a private party for the film in London.

04 of 49

CHARLIZE THERON

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Misha Japaridze/AP

The Hancock star blooms in a floral-laden Giambattista Valli fuchsia dress and Roger Vivier clutch at the Moscow premiere of the superhero film.

05 of 49

PARIS HILTON

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James Devaney/WireImage

The reality star steps out for a night on the town in N.Y.C. in a black and white graphic print dress.

06 of 49

KATE WALSH

KATE WALSH
John Sciulli/BEI

The small-screen star is sweet in a belted chiffon 3.1 Phillip Lim dress at the designer’s store opening in Los Angeles.

07 of 49

JADA PINKETT SMITH

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Dara Kushner/INF

The actress is sophisticated in slim jeans, a Valentino-belted purple Reem Acra bustier and YSL platform heels at the N.Y.C. premiere of Kit Kittredge: An American Girl.

08 of 49

EMMY ROSSUM

EMMY ROSSUM
Alberto E. Rodriguez/Getty

Celebrating Phillip Lim’s store opening in L.A., the actress is sunny in one of the designer’s yellow dresses and Cartier jewelry.

09 of 49

ANNE HATHAWAY

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Ray Tamarra/Getty

The recently single star is sleek and chic in a puff-sleeved Jasmine de Milo black dress, Brian Atwood heels and oversized shades at a Lancome-sponsored screening of the film in N.Y.C.

10 of 49

RIHANNA

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Evan Agostini/AP

The singer celebrates love – or at least Cartier Loveday – in New York City in a PPQ floral dress, Christian Louboutin booties and Cartier jewels.

11 of 49

NICOLE RICHIE

NICOLE RICHIE
ER/Flynet

The new mom turns up in jeweled Dries van Noten to the Cartier Loveday celebration where beau Joel Madden helped launch a Love bracelet to beneft the Richie-Madden Children’s Foundation.

12 of 49

SIENNA MILLER

SIENNA MILLER
PA Photos /Landov

The quirky actress pairs a vintage bowler hat with a long fringed Jasmile di Milo dress over pants at the Edinburgh International Film Festival premiere of The Edge of Love.

13 of 49

KEIRA KNIGHTLEY

KEIRA KNIGHTLEY
Steve Finn / Capital Pictures / Retna

Miller’s costar is a ’30s throwback in her white Chanel jumpsuit and black sequined jacket at the film’s Edinburgh premiere.

14 of 49

CHARLIZE THERON

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Matrix/Flynet

The Hancock star continues to heat up the red carpet in a architectural black Balenciaga dress with a daring slit.

15 of 49

ANNE HATHAWAY

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Andrew H. Walker/Getty

Despite her recent breakup, the actress puts on a happy face and a chic trench-inspired Preen dress, Giuseppe Zanotti metallic heels and Kwiat jewels while doing a Q&A at the Apple Store in New York.

16 of 49

HILARY DUFF

HILARY DUFF
Matt Sayles/AP

The actress launches her deep plum Love Bracelet that will benefit the charity Blessings in a Backpack in her cobalt 3.1 Phillip Lim dress and Bally clutch at the Cartier Loveday.

17 of 49

CHLOE SEVIGNY

CHLOE SEVIGNY

The actress makes a conservative appearance in a drop-waist white Sonia Rykiel dress and Chanel purse at the Cartier Loveday celebration in Los Angeles.

18 of 49

RIHANNA

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Anthony Dixon/WENN

The singer makes a bold appearance at BET in knee-high Balenciaga gladiator sandals, Made Her Think jewelry and a black miniskirt.

19 of 49

MISCHA BARTON

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Matrix/Flynet

The actress shows off a darker hair color and a mismatched melange of yellow shorts, printed vest and ruffled blouse at the Billionaire Boys Club launch at Harvey Nichols.

20 of 49

FERGIE

FERGIE
Matt Sayles/AP

Although a fan of Cartier, the singer tells PEOPLE that her favorite piece of jewelry is her engagement ring from fiancé Josh Duhamel – which goes nicely with her art-print Derercuny minidress and Jimmy Choo gladiator sandals.

21 of 49

ALICIA KEYS

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Jason Kempin/WireImage

The singer keeps it casual in a white lace top and dark jeans at the wrap celebration for her “As I Am” tour in New York.

22 of 49

JULIANNE MOORE

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Michael Simon/startraks

The actress takes a casual spin around New York City while toting her luxe Donna Karan purse and sporting Robert Marc shades.

23 of 49

CAMERON DIAZ

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Jason LaVeris/FilmMagic

The blonde is the picture of summer in her full-skirted floral Oscar de la Renta dress and red wrap at the Women in Film Crystal+Lucy Awards.

24 of 49

NICOLE RICHIE

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Matt Sayles/AP

The new mom is a haute hippie in her vintage Missoni caftan at the Women in Film Crystal+Lucy Awards.

25 of 49

CHARLIZE THERON

CHARLIZE THERON
Passig/DAVIDS/DAVIDS/WireImage

Continuing her red carpet streak, the Hancock star takes a winning risk in her asymmetrical Christian Lacroix dress, Neil Lane jewels and Dior ankle booties at the film’s Berlin premiere.

26 of 49

RACHEL BILSON

RACHEL BILSON
Evan Agostini/AP

The star shows off her slim figure in a white Hervé Léger dress, Lanvin heels and Romanek Los Angeles clutch at the Whitney Art Party in New York.

27 of 49

SALMA HAYEK

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Jason LaVeris/FilmMagic

The actress flaunts her post-baby body in a nipped-waist Alexander McQueen suit and YSL heels at the Women in Film Crystal+Lucy Awards.

28 of 49

RIHANNA

RIHANNA
Stephen Lovekin/Getty

The singer gets edgy at TRL in a black leather Thomas Wylde jacket, Made Her Think jewelry, a miniskirt and Giuseppe Zanotti lace-up boots.

29 of 49

EVA MENDES

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Dean McDonald/Splash News

The sexy star is elegant in an embellished Galliano gown and Cartier jewels at the Women in Film Crystal+Lucy Awards.

30 of 49

TAYLOR SWIFT

TAYLOR SWIFT
Evan Agostini/AP

The country star spends another stylish day at TRL in a black strapless Laila Azhar dress and Giuseppe Zanotti heels.

31 of 49

JADA PINKETT SMITH

JADA PINKETT SMITH
Jason LaVeris/FilmMagic

The petite actress makes the most of her frame in a shimmering silver Monique Lhuillier dress and retro waves at the Women in Film Crystal+Lucy Awards.

32 of 49

CHARLIZE THERON

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Fame

The Hancock star is a standout in a Dior white pouf-skirted dress and Neil Lane diamonds at the film’s world premiere in Paris.

33 of 49

ANNE HATHAWAY

ANNE HATHAWAY
Michael Germana/SSI Photo/Landov

The actress is appropriately glam in her feathered Bill Blass dress and Neil Lane jewels at the Get Smart premiere in L.A.

34 of 49

ASHLEY OLSEN

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Evan Agostini/AP

The star is low-key in a boyish black blazer from her own line The Row and Earnest Sewn skinny jeans at the Cinema Society and ACLU screening of Trumbo in N.Y.C.

35 of 49

EVA LONGORIA PARKER

EVA LONGORIA PARKER
Guignebourg/Nebinger/ABACA

The Desperate Housewife continues her streak of being très chic in a jeweled black Chanel dress at the Hancock premiere in Paris.

36 of 49

TAYLOR SWIFT

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Jeff Christensen/AP

The young country singer tries out a sophisticated new look in an off-the-shoulder white Laila Azhar dress and silver Giuseppe Zanotti heels while hosting TRL.

37 of 49

MANDY MOORE

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Donato Sardella/WireImage

The star enjoys herself at a dinner in honor of MaxMara in a simple red dress from the Italian line, Jimmy Choo wedges and a Romanek Los Angeles purple clutch.

38 of 49

KELLY RIPA

KELLY RIPA
Demis Maryannakis / Splash News

The perky talk show host goes high style in her black and white Gucci frock and crimped hair at the 7th Heroes of Hope Gala in N.Y.C.

39 of 49

KERRY WASHINGTON

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Alberto E. Rodriguez/Getty

The Obama supporter combines her passion for fashion and politics at a Fashion Votes event at the Nanette Lepore boutique in L.A. – appropriately wearing a sparkling dress by the designer.

40 of 49

HEIDI KLUM

HEIDI KLUM
Paul Hawthorne/Startraks

The Project Runway host is a retro throwback in her sharp white RM by Roland Mouret dress and red lips at the 67th Annual George Foster Peabody Awards in N.Y.C.

41 of 49

KATE WALSH

KATE WALSH
Mavrix

The TV doc sizzles in a polka-dotted Future Classics dress and white Christian Louboutin heels at the Lexus Style Villa in San Diego.

42 of 49

EVA LONGORIA PARKER

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ELIOT/Bauer-Griffin

The actress shops till she drops in skinny jeans, a button-down blouse and sky-high Christian Louboutin heels while in Paris.

43 of 49

RIHANNA

RIHANNA
George Pimentel/WireImage

The singer shows off her dancer’s form in latex leggings, a ruffled Thomas Wylde top, Made Her Think jewelry, Temperley London hat and lace-up boots backstage at the MuchMusic Video Awards in Toronto.

44 of 49

BROOKE SHIELDS

BROOKE SHIELDS
Demis Maryannakis / Splash News

The Lipstick Jungle star hits the Tony Awards in sequined Proenza Schouler and Fred Leighton jewels.

45 of 49

BEYONCé

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NYC2 / Splash News

The star sets of her all-white outfit with a colorful patchwork Dolce & Gabbana purse while lunching in New York.

46 of 49

MARY LOUISE PARKER

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CB/Splash News

Despite a broken toe, the Weeds star is a stand-out at the Tony Awards in a shimmering Alberta Ferretti dress, Sang A clutch, Rene Caovilla heels and Fred Leighton diamonds.

47 of 49

JADA PINKETT SMITH

JADA PINKETT SMITH
Tonya Wise/London Ent/Splash News

The petite actress pairs her jeans with a one-shouldered Zac Posen top and adorable yellow heels at the Los Angeles premiere of Kit Kittredge: An American Girl.

48 of 49

MANDY MOORE

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MS/CNB/Finalpixx

The singer beats the heat in an easy striped maxidress and sandals while running errands in L.A.

49 of 49

AUDRINA PATRIDGE

AUDRINA PATRIDGE
Jason LaVeris/FilmMagic

The reality star sparkles in a silver sequined minidress at the U.S. launch party for Kira Plastinina.

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