Jennifer Aniston & Angelina Jolie
It's the battle of the sheer black dresses as Jen hits her Just Go With It premiere this week in a look oddly reminiscent of Angie's 2009 Oscars ensemble.
Bee Shaffer & Halle Berry
Nina Ricci's corset dress is getting a lot of action—from an outing at last year's Met Gala Costume Ball to this year's Golden Globes. But who wears it best?
Katy Perry & Ashanti
Are you clamoring for Ashanti's curves in this single-shouldered Issa dress, or do you prefer to stick with Katy's streamlined look?
Kate Bosworth & Tilda Swinton
Both actresses put their own twists on this Jil Sander skirt, but does a T-shirt or white shirt dress it up enough?
Ellen Pompeo & Nicole Richie
These friends and fellow fashionistas wear a Winter Kate sequined mini to party in Vegas one year apart. What are the chances Nicole lent her dress to Ellen?!
Vanessa Williams, Khloé Kardashian Odom, Mary J. Blige
Alexander McQueen remains as relevant as ever—with this strapless chiffon dress appearing on all three ladies in 2009, 2011 and 2007, respectively. But whose styling really stands out?
(If Khloé wears it best, sound off in comments since there are only two voting options!)
Reese Witherspoon & Kirsten Dunst
This edition goes old-school in honor of the Golden Globes, tapping into a vintage feud when Reese stepped out to the 2006 ceremony in this Chanel dress...three years after Kirsten had already worn it!
Katharine McPhee & Anne Hathaway
If you're gonna duplicate, this electric-blue Marchesa dress is the one to do it with!
Juliette Lewis, Scarlett Johansson & Christina Aguilera
Dolce & Gabbana's lace cocktail dress has made multiple appearances on the red carpet this fall and, judging by the Hollywood love of all things lace right now, it might not be the last time we see this strapless frock! But who styles it best?
(If ScarJo wears it best, sound off in comments since there are only two voting options!)
Sarah Michelle Gellar & Diane Kruger
One Chanel dress, two radically different styles. Does Buffy's frilly version slay the competion, or are you in favor of the Inglourious Basterds star and her edgy update?
Carey Mulligan & Amanda Peet
Frilly 'n' feminine is the way to go for these two—both stepped out in Marc Jacobs' silk dress with crystal bow this fall.
Cameron Diaz & Taylor Swift
The beachy blond actress faces off against the cutie-pie country star over a black lace Jenny Packham mini. Who brings it best in this sexy dress?
Courtney Love & Julianne Hough
One's a little bit country, one's a whole lot of rock 'n' roll, but both ladies love Marchesa's black lace dress!
Chloë Sevigny & Liv Tyler
Anna Wintour & Carey Mulligan
The devil wears Lanvin...and so does the fearless ingénue who isn't afraid to put her quirky spin on this sleeveless animal-print dress.
Eva Mendes & Jenny McCarthy
It's a Flintstones-style fashion showdown as both ladies step out in single-shouldered Stella McCartney dresses with matching Dino prints.
Zoe Saldana & Paris Hilton
The hotel heiress cleans up nicely while the Avatar star keeps it consistently classy in this double vision Louis Vuitton dress.
Keira Knightley & Lea Michele
Floor length or above the knee, whose busy Erdem print dress gets your vote for best style?
Madonna, Rihanna & Blake Lively
It's a battle of the boots as the stars square off in Stella McCartney's sky-high thigh-highs.
(If Ri-Ri rocks it best, sound off in the comments!)
Demi Moore & Ciara
It's the cougar versus the cub as both ladies hit the carpet in virtually identical Balmain dresses.
Cruz Beckham & Shiloh Jolie-Pitt
Posh and Angie's kids square off in identical Flying Burrito Brothers T-shirts, but these kids are both so cute that we can't pick a favorite!
Kim Kardashian & Ciara
It's the BFF effect—friends who have the same taste in fashion turn up in identical outfits. Even Kim admits she's guilty as charged: "I think that happens when you're really close with your girl friends."
See more Fashion Police feuds on E! every Friday at 10:30 p.m.
Rosario Dawson & Naomi Watts
Maybe the ladies can offer each other a shoulder to lean on since this single-strapped Stella McCartney dress looks in danger of toppling both Rosario at the Unstoppable premiere and Naomi at the Met Costume Institute Gala Benefit.
Joan Rivers & Snooki
The Jersey Shore star seems flattered by this style showdown as Joan steals her signature look for the Fashion Police Halloween show. After all, imitation is the sincerest form of flattery.