1 of 29
HAYDEN VS. SIENNA
The Heroes star celebrated her 18th birthday by visiting The Late Show in her Alice + Olivia dress, while the British actress sparkles in her sequined minidress at a London club opening.
Alice + Olivia Sequin Strap Dress, $440 at shopbop.com
2 of 29
PADMA VS. CARMEN
The Top Chef host celebrated at a pre-Emmys party in her white Marc Jacobs dress, while the actress showed off her tiered black dress at the designer’s N.Y.C. fashion show.
3 of 29
HEATHER VS. EMILY
The Adrift in Manhattan actress played up her curves in her Michelle Jonas dress at a L.A. screening last November, while the Bones star sizzled in her clinging maroon number at a Hot in Hollywood event late this summer.
Michelle Jonas Short Keyhole Dress, $225 at michellejonas.com
4 of 29
LILY VS. KATE
The British singer dazzles in her Chanel dress at the GQ Men of the Year Awards in London, while the actress is picture-perfect in her black and white frock at the recent Chanel event in Los Angeles.
5 of 29
ASHLEY VS. AUDRINA
The High School Musical 2 star worked her LaRok minidress at a Los Angeles event in April, while the Hills costar was stylish in her little black dress at the Teen Choice Awards a few months later.
LaRok “Wendy” dress, $248 at thehipchick.com
6 of 29
LEVEN VS. MYA
The All My Children actress paid tribute to the Manhattan skyline in her Heatherette dress backstage at their February fashion show, while the singer showed off hers at the line s recent September show!
7 of 29
KATE VS. CHARLIZE
The Girl in the Park actress paired her lace Collette Dinnigan dress with a traditional headpiece for Australian Derby Day, while the In the Valley of Elah star was a bright spot in her white frock at the Venice Film Festival.
8 of 29
BIJOU VS. CARMEN
It was a real-life faceoff when both actresses turned up at the Jill Stuart fashion show in N.Y.C. in the same purple minidress from the designer!
9 of 29
RIHANNA VS. KIMBERLY
The sexy singer sizzled in her Gucci dress at the Kids Choice Awards, while the soon-to-be reality tv star got into the pattern mix with her printed mini while out to dinner in L.A.
10 of 29
KATE VS. THANDIE
Same dress, same festival – in 24 hours! The Girl in the Park star showed off her hot pink Preen dress at the film’s premiere in Toronto on Sunday, while the Run, Fat Boy, Run actress worked her pocketed frock at her own film screening the next night.
11 of 29
HILARY VS. EMILY
The singer rocked her Vivienne Westwood gown at the GLAAD Media Awards in N.Y.C. back in March, while the CSI: Miami star worked her plunging dress at the Fashion Rocks event in N.Y.C. last week.
12 of 29
LAUREN VS. RACHAEL
The Hills star tried on her French Connection dress at the brand’s beach house in Malibu a week before the actress wore her cobalt blue number to the Toronto premiere of In the Valley of Elah.
13 of 29
HAYDEN VS. VANESSA
The Heroes star hit the Late Show on her 18th birthday in her Alice + Olivia dress, while the High School Musical 2 actress dazzled at the film’s Australian premiere in her sequined minidress.
Alice + Olivia Sequin Strip Dress, $440 at thehipchick.com
14 of 29
STAR VS. CARMEN
The Court TV host showed off her Diane von Furstenberg dress while appearing on Live With Regis & Kelly, while the sexy star wore her two-tone dress to an N.Y.C. Fashion Week event.
Diane Von Furstenberg Contrast Tank Dress, $365 at neimanmarcus.com
15 of 29
SIENNA VS. JEMIMA
The actress was a vision in her white-and-gold Chanel dress at the Critic’s Choice Awards in January, while Hugh Grant’s main squeeze showcased her long legs in her minidress at a London charity event this week.
16 of 29
LILY VS. CAMERON
The British singer hit the V-Festival in her McQ-Alexander McQueen dress over jeans only a few days before the actress rehearsed in Manhattan for her new film What Happens in Vegas … in her billowing gray dress.
17 of 29
ASHLEY VS. KELLY
The High School Musical 2 star hit the film’s L.A. premiere in her white BCBG dress, while the rocker turned chic in her buttoned white dress at the Teen Choice Awards.
18 of 29
SOPHIA VS. CARIDEE
The One Tree Hill star brightened up a VS Beauty Secret Garden Re-Launch in the Hamptons in her BCBG dress, while the America’s Next Top Model winner was sunny in her yellow frock at a charity event in N.Y.C. only four days later!
19 of 29
AMANDA VS. GWYNETH
The new mom stepped out in her Marc Jacobs taffeta dress at an NBC party in July 2006, while the actress promoted a new Estee Lauder fragrance in her off-the-shoulder frock last week in Chicago.
20 of 29
ERIN VS. MICHELLE
The supermodel strutted her stuff in a feathered YSL dress at a party for the line in Los Angeles back in June, while The Heartbreak Kidactress joined the fashion flock in her little black dress at the film’s Los Angeles premiere last week.
21 of 29
JENNY VS. PARIS
The recent PEOPLE cover subject took her son out for some shopping in her Ella Moss minidress in L.A., while the heiress wore her striped dress to her sister Nicky’s birthday poker tournament in Las Vegas a few weeks later.
Ella Moss Coney Island Stripe Dress, $134 at revolveclothing.com
22 of 29
23 of 29
LIV VS. EVA
The Reign Over Me actress put a new spin on the little black dress in her Zac Posen at the Toronto Film Festival, while the We Own The Night star sizzled in her backless dress at The Late Show in N.Y.C. this week.
Zac Posen Runway Tweed-Printed Delos Dress, $2100 at eluxury.com
24 of 29
ALYSON VS. JESSICA
The How I Met Your Mother star perked up a coffee outing in her Jenny Han shirtdress and knee-high boots, while the same night, the singer took a more revealing approach to her silk dress while clubbing in N.Y.C.
Jenny Han Shirt Dress, $160 at shopintuition.com
25 of 29
CARMEN VS. JAMIE-LYNN
Electra hit N.Y.C Fashion Week in her two-tone Diane von Furstenberg dress, while The Gathering actress brightened up a morning talk show in her turquoise and black frock a few weeks later.
Diane von Furstenberg “Rosario” dress, $365 at dvf.com
26 of 29
SIENNA VS. KATIE
THE Factory Girl actress dazzled in her Balenciaga babydoll at the film’s London premiere in March, while the Mad Money star looked chic in her sequined mini while boarding a flight in Berlin this week.
27 of 29
PARIS VS. DAISY VS. BROOKE
Hilton first rocked the Black Halo dress this summer for a night out, while this week Fuentes looked sleek in hers at the Padres Contra El Cancer event in Los Angeles and Shields was chic in hers at a Coach dinner in N.Y.C.
Black Halo One Shoulder “Jackie” dress, $313 at shopintuition.com
28 of 29
CAMERON VS. PINK
The actress showed off her famous legs in her Zac Posen minidress at a photocall for Shrek the Third in Berlin last June, while the singer hit a L.A. pumpkin patch in her flirty frock this week.
29 of 29
HAYDEN VS. JESSICA
The Heroes star hit the streets of Manhattan in her What Comes Around Goes Around minidress back in September, while the singer dazzled in her sequined minidress at a Clothes Off Our Backs event in Los Angeles this week.
What Comes Around Goes Around “Anita” dress, $450 at shopbop.com
We Wore What's Danielle Bernstein Launched Clothing at Bloomingdale's - Here's what We're Buying