Who Had the Hotter Backless Dress: Olivia Wilde or Amanda Seyfried?

Celebrity Style October 21, 2011 AT 12:53PM By Ariana Finlayson

Credit: Jon Kopaloff/FilmMagic; Jordan Strauss/WireImage

Olivia Wilde in Yigal Azrouel

76% 1083

Amanda Seyfried in Prabal Gurung

24% 347

1430 votes Back To Poll »

Taking a cue from their In Time co-star Justin Timberlake, Olivia Wilde and Amanda Seyfried opted to bring sexy back at the flick's premiere in Westwood, Calif. Thursday.

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The two stunners (who've both been rumored to having been tied romantically to Timberlake in the past) bared their backs in flirty frocks on the Regency Village Theater red carpet.

Wilde, 27, looked gorgeous in a black floor-length Yigal Azrouel gown paired with gold accessories and Christian Louboutin sandals.

PHOTOS: Olivia Wilde's sexy style moments

Showing off the results of her Barry's Bootcamp sessions, Seyfried, 25, donned a colorful knee-length dress by Prabal Gurung that featured a plunging, V-shaped scoop in the back.

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Both stars wore their hair down and loose aound their shoulders and added a touch of drama to their looks with smoky eye makeup.

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