Rooney & Kate Mara
These silver-screen stunners couldn't be more different when it comes to fashion. Are you more on board with Rooney's edgy style, or do you prefer Kate's feminine, romantic look?
Tia & Tamera Mowry
These ladies grew up in front of the camera, so it's no wonder they know how to work their looks. Here, Tia's pop of color and asymmetric styling look fresh and edgy while Tamera's gown is all Old Hollywood elegance.
Paris & Nicky Hilton
These two heiresses definitely know how to work a red carpet. Do you prefer older sister Paris' glam goddess looks or younger sister Nicky's laid-back, more sensible style?
Beyoncé & Solange Knowles
Beyoncé's younger sis takes some bold risks, but do they pay off? Or does big sis B still top the charts when it comes to fierce fashion?
Jessica & Ashlee Simpson
These singing sisters are definitely opposites. Older sister Jess rocks the girly getups, while younger sister Ashlee definitely opts for a hipper, edgier style.
Kendall & Kylie Jenner
The Kardashian girls sure know how to dress, and their adorable Jenner half-sisters are no exception! But will Kendall or Kylie be voted most likely to follow in Kim, Kourtney and Khloé's high-fashion footsteps?
Kate & Pippa Middleton
Despite having a princess for a big sis, younger sister Pippa definitely holds her own when it comes to dressing up.
Ashley & Mary-Kate Olsen
These twins definitely turn heads when it comes to their wardrobes, but not always in a good way. So would you rather take a turn in slightly younger Mary-Kate's closet full of oversize vintage numbers or through two-minutes-older Ashley's more up-to-date looks?
Dakota & Elle Fanning
These stylin' sisters aren't just members of Young Hollywood, they've made names for themselves in the fashion world, too. So do you prefer big sis Dakota's leggy looks or little sis Elle's whimsical flare?
Emily & Zooey Deschanel
Older sister Emily's classy contemporary or little sister Zooey's indie chic? You decide.
Haylie & Hilary Duff
The blond beauties have blossomed into dapper dressers, but there can only be one winner when it comes to our sisterly style showdown! Is it big sister Haylie or little sister Hilary?