Last Night's Look: Hit or Miss?

Vote on this week's styles including Sienna Miller, Nicole Richie and more stars! You decide – are they fashionistas or flops?

01 of 50

SIENNA MILLER

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Chelsea Lauren/WireImage

Another day, another fabulous look! channels old Hollywood glam in her lizard print silk chiffon YSL gown, H. Stern jewels and retro beauty for the Hollywood premiere of G.I. Joe: The Rise of the Cobra.

02 of 50

NICOLE RICHIE

NICOLE RICHIE
Michael Kovac/FilmMagic

She really is her own best model! At the launch of her new maternity collection, “Nicole” for A Pea in the Pod, showed off her growing baby bump in a tight black mini dress and billowy gray floral printed cardigan from the line, accessorized with a locket from her House of Harlow 1960 jewelry line.

03 of 50

HALLE BERRY

HALLE BERRY
John Shearer/Getty

Forget the designer denim! helps celebrate the launch of the Gap 1969 Jeans Shop in a pair of Gap skinny jeans dressed up with a black button-front T-shirt, silver bangles, a leopard print clutch and platforms.

04 of 50

DEMI MOORE

DEMI MOORE
Todd Williamson/WireImage

With autumn right around the corner, the gets in season with her burnt orange frock complete with a jeweled brooch and matching gray heels for the 5th Annual HollyShorts Film Festival’s Opening Night Celebration in West Hollywood.

05 of 50

ASHLEE SIMPSON-WENTZ

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John Shearer/Getty

The Melrose Place tops her faded blue jeans and white sandals with a Gap boyfriend blazer and loads of gold jewelry for the launch of the Gap 1969 Jeans Shop in West Hollywood.

06 of 50

KIRSTEN DUNST

KIRSTEN DUNST
Todd Williamson/WireImage

Feeling blue? The matches her navy strapless Miu Miu frock to her smokey blue eyes and black pumps for the 5th Annual HollyShorts Film Festival’s Opening Night Celebration in L.A.

07 of 50

VANESSA HUDGENS

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Jesse Grant/WireImage

After making the talk show rounds in New York, adds her star power to the L.A. Bandslam premiere in a floral appliqu topped Georges Hobeika bubble dress, accessorized with a black jeweled bib House of Lavande necklace and matching patent heels.

08 of 50

HEIDI MONTAG

HEIDI MONTAG
Jon Kopaloff/FilmMagic

The Hills goes disco diva in her sheer sequined top, black hot pants and exotic skin Christian Louboutin booties for the G.I. Joe: The Rise of the Cobrapremiere.

09 of 50

CIARA

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Axelle/Bauer-Griffin

The singer cuts an enviable figure in a curve-hugging white sheath Herve L. Leroux dress topped with a sparkling statement necklace for the G.I. Joe: The Rise of Cobra premiere in Hollywood.

10 of 50

JESSICA STROUP

JESSICA STROUP
Chris Polk/FilmMagic

The 90210 star gets a jump-start on fall with shorts over black tights and booties topped with a tuxedo jacket and black-and-white top for the K-Swiss “Classic” Dinner at the Chateau Marmont in L.A.

11 of 50

DEMI MOORE

DEMI MOORE
PA Photos/Landov

Ever the supportive spouse, the brings her star power to the Las Vegas screening of husband new movie Spread in a one-shoulder crepe RM by Roland Mouret black cocktail dress, metallic gold Bally heels and matching hoop earrings.

12 of 50

KIM KARDASHIAN

KIM KARDASHIAN
Albert Michael/Startraks

Single life is treating her well! takes a fashion-forward approach in a baggy men’s button down, high-waisted harem pants, patent sandals and hot pink nails at the launch of Project Runway winner Christian Siriano’s limited edition VS Makeup line in Los Angeles.

13 of 50

EVA LONGORIA PARKER

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Anthony/Pacific Coast News

The stops traffic on a Hollywood street in a colorblock belted satin sheath and buckled heels after a dining at Beso.

14 of 50

RACHEL BILSON

RACHEL BILSON
Splash News Online

Who wears short-shorts? turns the sidewalk into the catwalk in her billowy nude top, cuffed denim shorts, big brown belt, metallic gladiator sandals and signature Chanel bag while out in West Hollywood.

15 of 50

SELENA GOMEZ

SELENA GOMEZ
Albert Michael/Startraks

She might have just turned 17, but the is all grown-up in her belted floral dress and matching pumps backstage at the The View.

16 of 50

MICHELLE TRACHTENBERG

MICHELLE TRACHTENBERG
Jen Lowery/Startraks

On-screen she might play a villain, but the Gossip Girl star is perfectly sweet in her beaded pleated chiffon dress, metallic silver clutch and nude peep-toes at the NBC Universal Press Tour All Star Party in Pasadena, Calif.

17 of 50

JOY BRYANT

JOY BRYANT
Axelle/Bauer-Griffin

Making red carpet style look effortless, the actress goes casual in a white satin jumpsuit, black beaded necklace and beach waves at the Hollywood premiere of A Perfect Getaway.

18 of 50

SHENEA GRIMES

SHENEA GRIMES
Jean Baptiste Lacroix/WireImage

The 90210 star adds an edge to her off-the-shoulder black satin dress with a thick gold-accented belt, chain-strap bag and metallic pumps at the Supperclub and Instyle dinner party in Los Angeles.

19 of 50

MALIN AKERMAN

MALIN AKERMAN
Jean Baptiste Lacroix/WireImage

Showing off a seriously toned figure, the Watchmen star keeps it simple in a burgundy halter minidress and neutral strappy sandals at the Supperclub and Instyle dinner party in Los Angeles.

20 of 50

KATHERINE HEIGL

KATHERINE HEIGL
Joel Ryan/AP

The Ugly Truth slips into an enviable green one-shoulder Naeem Khan frock, Joan Hornig jewels and metallic Jimmy Choo pumps at the film’s London premiere.

21 of 50

VANESSA HUDGENS

VANESSA HUDGENS
Darla Khazei/Pacific Coast News

InStyle Makover’s current sets hearts aflutter in a white shirtdress with billowy sleeves and nude sandal booties while leaving MTV’s New York City studios.

22 of 50

SIENNA MILLER

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Janet Mayer/Splash News Online

Continuing her whirlwind of wardrobe changes, the G.I. Joe: Rise of Cobra rings the opening bell of the New York Stock Exchange in a cinch-waist jacquard Stella McCartney dress and classic black pumps.

23 of 50

ASHLEE SIMPSON

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Vince Flores/Celebrity Photo

Another day, another gorgeous outfit! The is sweet in a blue romper festooned with golden chains and strappy heels at a TCA event in Pasadena, Calif.

24 of 50

RIHANNA

RIHANNA
Santiago Baez/Ramey

The is pretty in prints, pairing a floral Parker minidress with open-toed platform boots and super-sized hoops in lower Manhattan.

25 of 50

SHAKIRA

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Antoine Decaux/FilmMagic

Her hips don’t lie – and neither does her barely-there, sheer-panel dress, which reveals the singer’s flawless figure on the streets of Paris.

26 of 50

CIARA

CIARA
Bennett Raglin/WireImage

Looks like her hair isn’t the only thing the singer has taken shears to recently, pairing fashionably distressed skinny jeans with open-toed boots, a white tee and a cropped motorcycle jacket at the Staples/Do Something 101 school supply drive in N.Y.C.

27 of 50

KATE MOSS

KATE MOSS
ANG/Fame

The goes casual while on holiday in St. Tropez in a belted T-shirt minidress, straw tote, and shades.

28 of 50

MARY J. BLIGE

MARY J. BLIGE
Demis Maryannakis/Splash News Online

The diva is gorgeous in a chocolate-brown Gucci wrap dress with blouson sleeves and ankle-strap sandals at the Foundation for the Advancement of Women Now event in New York.

29 of 50

RACHEL NICHOLS

RACHEL NICHOLS
Anderson/Bauer-Griffin

All eyes are on the G.I. Joe: Rise of Cobra actress in a raspberry kimono BCBG Max Azria minidress and white pumps while she heads back to her hotel after promoting the film in New York City.

30 of 50

ASHLEE SIMPSON-WENTZ

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INF

The sizzles at the TCA Summer Tour party in Pasadena, Calif., in a ruffle-sleeve tweed frock with sheer panels and ankle-wrap sandals.

31 of 50

BEYONCé

BEYONCé
Lawrence Schwartzwald/Splash News Online

She’s got legs! And knows how to use them, making L.A.’s streets sizzle in a belted plaid romper and patent platforms.

32 of 50

SIENNA MILLER

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Bill Davila/Startraks

A hot new film calls for a celebration – and the gets the party started in a confetti-printed Diane von Furstenberg dress and neutral T-straps while promoting her film G.I. Joe: The Rise of Cobra on the CBS’s The Early Show in N.Y.C.

33 of 50

PENéLOPE CRUZ

PENéLOPE CRUZ
James Coldrey/WireImage

Lost luggage might have recently left the red-carpet wardrobe up to fate, but for the film’s German premiere, she is perfectly elegant in a draped forest-green one-shoulder Herve Leroux gown and classic jewels.

34 of 50

DEMI MOORE

DEMI MOORE
Steve Granitz/WireImage

The is Hollywood royalty in an asymmetrical periwinkle Louis Vuitton dress and matching pumps at the premiere for husband film Spread in Hollywood.

35 of 50

RUMER WILLIS

RUMER WILLIS
John Shearer/WireImage

Proving that style runs in the family, Demi’s daughter shows off her flawless figure in a strapless metallic Karen Millen frock with sweetheart neckline and gladiator heels while supporting her stepdad on the Spread red carpet.

36 of 50

JANUARY JONES

JANUARY JONES
Jason LaVeris/FilmMagic

Mad Men’s resident blonde bombshell sizzles in a retro Andrew Gn frock with plunging peekaboo diamonds at the show’s season three premiere in West Hollywood.

37 of 50

SOPHIA BUSH

SOPHIA BUSH
Michael Tran/FilmMagic

The One Tree Hill star puts a technicolor spin on a ’50s silhouette in a brightly printed dress matched to her scarlet lips and classic pumps at the TCA Summer Tour party in Pasadena.

38 of 50

CHRISTINA HENDRICKS

CHRISTINA HENDRICKS
Jason LaVeris/FilmMagic

The auburn beauty is fashion-forward at the Mad Men season three premiere in West Hollywood in a one-shoulder Malandrino frock accented with a high-drama sweep of feathers and appliqués.

39 of 50

COURTNEY LOVE

COURTNEY LOVE
Charles Eshelman/FilmMagic

The singer’s a one-armed bandit at the screening of It Might Get Loud in lower Manhattan in a classic gray frock that goes avant garde with a conspicuously absent sleeve, tights and lace-up shoes.

40 of 50

BLAKE LIVELY

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Dimitrios Kambouris/WireImage

Skipping her high-fashion Gossip Girl costumes, goes for preppy-with-an-edge in her striped button-down, white miniskirt and layered chain necklace for the 12th annual Super Saturday Ovarian Cancer Research Fundraiser hosted by InStyle Magazine and Donna Karan in the Hamptons.

41 of 50

JESSICA SIMPSON

JESSICA SIMPSON
WIC/Fame

No tears here! The newly single flashes a dazzling smile in an AKA New York floral romper, metallic gold wedges and large Louis Vuitton bag for a night out with sister in West Hollywood.

42 of 50

JENNIFER LOPEZ

JENNIFER LOPEZ
Grifoni-Sarmiento/Splash News Online

After glamming it up for her 40th birthday, the goes beach chic in a leaf-printed tunic, gold-tinted aviators and loose pigtails while enjoying some vacation time in Capri, Italy, with husband Marc Anthony.

43 of 50

FREIDA PINTO

FREIDA PINTO
Richard Young/Startraks

The stylish star hits a fashionable note in her black sheer-topped Stella McCartney frock and metallic gold accessories at a London screening of Slumdog Millionaire.

44 of 50

TAYLOR MOMSEN

TAYLOR MOMSEN
Gary Gershoff/WireImage

Gossip Girl’s youngest channels ’90s grunge in an asymmetrical hem plaid dress, accessorized with piped peep-toe ankle boots, a black-beaded rosary, a mix of bracelets and bold red lips at a Sephora store opening in New York’s Times Square.

45 of 50

SIENNA MILLER

SIENNA MILLER
Jeff Snyder/PictureGroup

Continuing her fashionable tour, balances a vintage-inspired pleated-top frock with edgy studded booties at the Army & Air Force Exchange Service-hosted premiere of G.I Joe: The Rise of Cobra.

46 of 50

LINDSAY LOHAN

LINDSAY LOHAN
Albert Michael/Startraks

The newly blonde goes casual in a bold blue tank, zipper-detailed skinny jeans, platform sandals and her gold-tinted aviators for a celebration in honor of handbag line Treesje’s Magnolia Collection relaunch at Kitson in L.A.

47 of 50

DIANE KRUGER

DIANE KRUGER
Snapper Media / Splash News Online

The Inglorious Basterds actress is red hot in her one-shoulder Marchesa scarlet frock, sparkling navy blue pumps and House of Lavande bracelet for the movie’s Sydney Gala premiere.

48 of 50

KELLY RIPA

KELLY RIPA
Dimitrios Kambouris/WireImage

The goes hippie-chic in a scarf-printed Etro maxidress accessorized with stacks of metallic bangles and a long, gold fish-charm necklace at the 12th annual Super Saturday Ovarian Cancer Research Fundraiser hosted by InStyle Magazine and Donna Karan in the Hamptons.

49 of 50

MISCHA BARTON

MISCHA BARTON
Jackson Lee / Splash News Online

Back on the party scene, the shows some serious skin in a dominatrix-inspired cut-out black minidress, black tights and matching booties for a night out in New York City.

50 of 50

CHRISTIE BRINKLEY

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Lisa Wagner / Splash News Online

The former supermodel is the picture of summer chic of in her canary yellow Ralph Lauren gown and colorful beaded necklace at the Southampton Hospital’s annual Summer Benefit Gala.

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