1 of 34
MISCHA VS. PARIS
The actress attended a party for Dsquared in L.A. in the line’s jewel-topped gown in November, while the heiress hit the Cannes party scene at Terrazza Martini hosted bash in her white dress this week.
2 of 34
KEIRA VS. DITA
The British actress hit the red carpet for The Duchess premiere in her Alexis Mabille dress last September, while the burlesque queen wowed at Cannes in her net-adorned frock this week.
3 of 34
ZOE VS. OLIVIA
The Star Trek star was out of this world at the Diane von Furstenberg show at Fashion Week last September in the designer’s printed minidress, while the City costar topped her dress with a cardigan for an event to honor von Furstenberg herself.
4 of 34
HEIDI VS. DANIA
The Project Runway host hit the show’s finale runway in her Matthew Williamson suit, while the actress picked just the hot-pink blazer for a charity event in Los Angeles.
5 of 34
DEMI VS. AUBREY
The ageless star lit up a Donald Trump-hosted bash in New York City in her Zac Posen dress, while the singer celebrated the Tribeca Film Festival in her ruffled blue dress.
6 of 34
RIHANNA VS. PARIS
The singer hit the streets of N.Y.C. in her Alexander Wang minidress only a week before the heiress visited The Late Show with David Letterman in her nude-and-black frock.
7 of 34
KRISTEN VS. ASHLEE
The actress paired her 3.1 Phillip Lim tank top with khakis for an A/X party in L.A., while the Melrose Place star wore her tribal printed top for a day of family fun in Manhattan.
8 of 34
KATE VS. CHLOE
Bosworth added a simple white tank to her Chloé short suit for a BlackBerry party in October, while Sevigny gave her scalloped suit a vintage feel with a straw topper and buttoned-up blouse for a polo match in New York this week.
9 of 34
KOURTNEY VS. KIM
Sister showdown! The eldest Kardashian celebrated the ribbon cutting for the siblings’ boutique Dash in Miami in her Bebe romper, while Kim took a spin in the same coral romper while rollerblading in Miami later that week.
10 of 34
MOLLY VS. LAURA
Sims partied in Miami for New Year’s Eve in her Julie Haus dress, while the ageless Leighton celebrated the revamped version of Melrose Place in her pink satin frock.
11 of 34
AUDRINA VS. EVA
The PETA spokesperson unveiled her ad in her Stella McCartney jumpsuit, while the actress headed through Heathrow Airport in her cream one-piece.
12 of 34
MILEY VS. MAGGIE
The teen superstar paired her Nanette Lepore dress with red peep-toe heels for a morning talk show appearance, while the actress kept it neutral for an event in Los Angeles.
13 of 34
CHARLIZE VS. MOLLY
Theron paired her Rag & Bone blazer with leather leggings for a Fashion Week event last September, while Sims chose cropped black pants for her silver blazer at a screening this month.
14 of 34
BRENDA VS. LO
The Suite Life of Zack & Cody actress celebrated her 21st birthday in her Voom by Joy Han dress, while the Hills costar hit the MTV Movie Awards in her teal minidress.
15 of 34
HEATHER VS. KRISTIN VS. HEIDI
One dress, three stars, one week! Graham first wore her Hervé Léger to the Hangover premiere, followed a day later by Cavallari, who wore it to a fashion party in L.A. finished the week by wearing the slashed dress to dinner in N.Y.C.
16 of 34
RIHANNA VS. BEYONCé
skipped pants to wear her Matthew Williamson jacket as a dress in N.Y.C., while paired her leather coat with a pale dress in London.
17 of 34
CLAIRE VS. CHELSEA
finished off her Lanvin dress with a nude beaded necklace from the French label for the Independent Spirit Awards, while Handler left her beige bustier dress simply chic for the Crystal & Lucy Awards this weekend.
18 of 34
ANNALYNNE VS. BRITANNY
The 90210 star set off her Alice + Olivia dress with Guess by Marciano booties for the Young Hollywood Awards, while the Valley Girls actress paired her black strapless dress with Judith Ripka jewelry for a charity gala in N.Y.C.
19 of 34
AMY VS. KATHY
Comedienne faceoff! Poehler picked the pale version of her Karen Millen dress for the Gracie Awards in New York City, while Griffin set off her fiery locks with the cobalt sheath dress during her appearance on The Late Show with David Letterman.
20 of 34
KATE VS. LAUREN
The topped her Kate Moss for Topshop dress with a blazer for the opening of the British chain’s Manhattan flagship store, while the went for a light gray jacket to cover her printed mini while promoting L.A. Candy in N.Y.C.
21 of 34
EVA VS. PADMA
pared things down in her Halston jumpsuit at a charity event in N.Y.C., while Lakshmi added gold jewelry from her own line while visiting The Late Show with David Letterman in her mauve one-piece.
22 of 34
PARIS VS. DEMI
hit The Late Show with David Letterman in her Alexander Wang dress, while attended the Toronto premiere of Princess Protection Program in her two-tone minidress.
23 of 34
DEMI VS. CINDY
attended a hotel launch in N.Y.C in her Zac Posen dress last summer, while Crawford launched a new Remington hair straightener in her cobalt blue halter this week in Buenos Aires.
24 of 34
KOURTNEY VS. ESTELLE
The reality star put the focus on her Matthew Williamson for H&M dress at the Dash Boutique opening in Miami. A week later the singer added a denim jacket to her boldly printed maxidress at an event for H&M.
25 of 34
RIHANNA VS. JESSICA
hit the streets of N.Y.C. for a day of shopping in her J Brand “Zombie” jeans, while flaunted her new blonde locks in her distressed gray jeans in Los Angeles.
26 of 34
ANNA VS. JESSICA
Faris modeled her Michael Kors dress at a photo shoot in Los Angeles, while hit a high note while performing the national anthem in her striped sheath.
27 of 34
ZOE VS. FERGIE
The Star Trek actress picked a black-and-silver Emilio Pucci dress for the film’s L.A. premiere, while went for a more cut-out silver-and-green version while visiting Late Night with David Letterman.
28 of 34
ELSA VS. MEGAN
The Spanish actress lit up a Vogue party in Milan in her Dolce & Gabbana dress, while the sizzled at the MTV Movie Awards in her gilded floral minidress.
29 of 34
GWEN VS. LIV
added a pop of color with her own L.A.M.B. purse to her A.L.C. leather jacket, while kept her look monochromatic to highlight her gray-lined black leather jacket.
30 of 34
CARRIE VS. WHITNEY
The got glam at a pre-Grammys party in her Pamella Roland dress, while the City star showed off her endless legs in her dotted minidress at a fashion event in N.Y.C. this week.
31 of 34
EMILY VS. MEGAN
The Bones star was ferocious in her Stella McCartney T-shirt at a screening at the designer’s L.A. boutique, while the sex symbol heated up Fuse’s studio in her leopard shirt.
32 of 34
LYDIA VS. HOLLY
Hearst hit a magazine party in N.Y.C. in her sparkling dress by The Blondes, while Madison celebrated her starring role in PEEPSHOW in her star-spangled minidress in Las Vegas.
33 of 34
HEIDI VS. KIM
stayed stylish for a plane flight in her Rich & Skinny jeans, while hit an AXE launch party in the same “Devastated Superskinny” pair.
34 of 34
ERIN VS. PARIS
The City costar shows off her modeling skills in her Bilingual Clothing dress at a PEOPLE event in N.Y.C., while the hit an L.A. premiere in her peacock-print dress.
Lady Gaga Returns to Her Wild Style in Cheeky Satin Marc Jacobs Hot Pants
Ireland Baldwin Gets an Early Start on Halloween with a Racy (and Bloody) Costume
Back to Brunette! Demi Lovato Ditches the Blonde After Short-lived Stint
WATCH: Rihanna Teaches Her Niece Majesty How to Do a Manicure