1 of 30
KIM VS. KOURTNEY
Sister battle! wore her H&M white sheath to a magazine party in L.A. in May, while her pregnant sibling Kourtney wore the stretchy dress to Kim’s birthday party in Las Vegas this past weekend.
2 of 30
ANNE VS. MARIAH
flaunted her figure in her second-skin Hervé Léger by Max Azria dress at NBC studios in N.Y.C., while topped off her red-hot mini with a trench for her arrival at the Narita airport in Japan.
3 of 30
DEMI VS. HEATHER
The ageless hit an N.Y.C. party last year in her Zac Posen dress, while the Melrose Place actress returns home, shooting a scene as Amanda Woodward in the ruffled cobalt dress.
4 of 30
RIHANNA VS. NAOMI
The celebrated a pal’s wedding in Italy in her Alexander Wang minidress, while the supermodel topped her purple dress off with a furry shrug at the 4th Annual Black Girls Rock Awards in N.Y.C.
5 of 30
MEGAN VS. AMBER
The sizzled in her lilac Antonio Berardi frock for the Jennifer’s Body premiere in Los Angeles, while girlfriend picked the red version of the ruffled dress for the Elle Women in Hollywood event.
6 of 30
KYLIE VS. SHAKIRA
The Aussie songstress chose her Balmain dress for a charity event in May, while the South American famously had a real-life faceoff with in her Balmain dress a few months later at the VMAs.
7 of 30
CHLOE VS. ELIZA
The Big Love star keeps it simple, adding black accessories to her Kimberly Ovitz dress at a BlackBerry party this summer. The Dollhouse star takes her nude mini to the max, adding on a bold necklace, one glove and two-tone heels at The Late Show with David Letterman.
8 of 30
SHENAE VS. KOURTNEY
The 90210 star attended an InStyle party in August in her Isabel Lu dress, while the mom-to-be accented her tummy last week in her blue satin minidress.
9 of 30
TORI VS. ALESSANDRA
Backstage faceoff! and Ambrosio turned up to designer Christian Siriano’s show in metallic minis from his collection – blackened gold for the actress and bright gold for the supermodel.
10 of 30
BLAKE VS. KHLOE
The Gossip Girl got into character as Serena van der Woodsen in her Alexander Wang dress, while the newlywed hit a party in L.A. in her draped purple mini.
11 of 30
HALLE VS. FREIDA
ran errands in L.A. in her turquoise Dream Culture dress, while Pinto hit the streets of London in her cream version of the trapeze dress.
12 of 30
KIM VS. BETHENNY
The added a black blazer and pink heels to her Nuj Novakhett dress, while the mom-to-be kept it simple with loose curls over her striped mini.
13 of 30
ALI VS. JORDANA
The new picked a full-skirted Carolina Herrera for a Cirque du Soleil party in L.A., while the brunette hit the Jane Goodall Institute Global Leadership Awards Celebration in a sheath version of the blue floral frock.
14 of 30
JULIE VS. PAULA
The Boondock Saints II: All Saints Day actress paired her lavender Bottega Veneta dress with thigh-high boots for the film’s premiere, while the newly pregnant actress shortened her corset into a mini for the AFI Fest in L.A.
15 of 30
KELLY VS. RIHANNA
The Dancing with the Stars contestant belted her Marc Jacobs dress for a day of shopping in L.A., while the added a military hat and leopard-print booties to her gray sweater dress for a flight to Paris.
16 of 30
KATE VS. MARIAH
The Oscar dazzled at the BAFTAs in London in her Zac Posen gown in February, while the sizzled in her mermaid gown at the premiere of her film Precious this week.
17 of 30
EVA VS. SELITA
The was radiant in her white J. Mendel at the Middle East International Film Festival, while the supermodel lit up the Glamour Women of the Year Awards in her draped column gown.
18 of 30
CAMILLA VS. KATY
The actress lit up the Rodeo Drive Walk of Style in her Marchesa dress, while the picked the feathered frock for one of her many wardrobe changes while hosting the European Music Awards.
19 of 30
LAUREN VS. LINDSAY
celebrated designer Rebecca Minkoff’s Spring 2010 line in her polka-dotted shirt, while hit the town in L.A. in her polka-dotted blouse under a cropped blazer.
20 of 30
CIARA VS. KIM
The singer hit the streets of L.A. in her Zara dress, while the stepped up in her sharp-shouldered dress (only $99!) for a charity event.
21 of 30
VICTORIA VS. DREW
modeled a dress from her own collection while judging American Idol auditions in Denver, while hit the premiere of Everybody’s Fine in her slim purple sheath.
22 of 30
KATY VS. RUTINA
The attended the Jean Paul Gaultier fashion show in Paris in the designer’s dress, while the True Blood actress picked the chic LBD for the show’s second season premiere.
23 of 30
LO VS. PARIS
The Hills sidekick hit the town with her castmates in July in her Topshop dress, while the paired her floral dress with a Zara Terez clutch for shopping in L.A. this week.
24 of 30
JESSICA VS. MANDY
flaunted her famous physique in her ivory 3.1 Phillip Lim gown at an N.Y.C. premiere in May, while wore the black version of the dotted gown to a charity event in L.A. in November.
25 of 30
ZOE VS. SOPHIA
The Star Trek star paired her Helmut Lang tunic with leggings for an Audi event in L.A., while a few weeks later, the One Tree Hill actress matched her brushstroke-print dress with opaque tights and booties for a N.Y.C. screening.
26 of 30
CIARA VS. KIM
BFF battle! The singer celebrated the release of her album Fantasy Ride in May in her Brian Lichtenberg mini, while the hit Las Vegas for her birthday in her sharp-shouldered dress in October.
27 of 30
JENNIFER VS. SHAKIRA
celebrated the release of her new single “Fresh Out of the Oven” in Miami in her Hervé Léger by Max Azria dress, while performed at the AMAs in her glittering minidress.
28 of 30
RIHANNA VS. KATY
Singer showdown! pairs her $49 H&M dress with a Louis Vuitton fannypack for a night out in London, while belts hers in Los Angeles.
29 of 30
SANDRA VS. EVA
The TV Food Network host hit the Daytime Emmy Awards in her Badgley Mischka dress, while got philanthropic at an L.A. event in her ruched red satin frock.
30 of 30
ANNE VS. CHANEL
The attended the 18th Annual Empire State Pride Agenda Fall Dinner in her Marc Jacobs dress, while the model celebrated her first time walking the Victoria’s Secret runway in her rainbow-tipped dress.
7 Goop-Approved Gifts in Honor of Gwyneth Paltrow's 44th Birthday
Gigi Hadid Opens Up About Fighting Back After Milan Fashion Week Attack: 'I Felt I Was in Danger'
14 Actual Outfits You Can Wear With Leggings, Inspired by Celebs
The Sexy Cast of Younger Shares Their Secrets to Feeling, Well, Younger!
Who's Caroline Manzo's Most Stylish Son? The Manzo'd with Children Star Gets Candid!