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.

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.

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.

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

-0%1%2%3%4%5%6%7%8%9%10%11%12%13%14%15%16%17%18%19%20%21%22%23%24%25%26%27%28%29%30%31%32%33%34%35%36%37%38%39%40%41%42%43%44%45%46%47%48%49%50%51%52%53%54%55%56%57%58%59%60%61%62%63%64%65%66%67%68%69%70%71%72%73%74%75%76%77%78%79%80%81%82%83%84%85%86%87%88%89%90%91%92%93%94%95%96%97%98%99%100%
1,087 Votes
-0%1%2%3%4%5%6%7%8%9%10%11%12%13%14%15%16%17%18%19%20%21%22%23%24%25%26%27%28%29%30%31%32%33%34%35%36%37%38%39%40%41%42%43%44%45%46%47%48%49%50%51%52%53%54%55%56%57%58%59%60%61%62%63%64%65%66%67%68%69%70%71%72%73%74%75%76%77%78%79%80%81%82%83%84%85%86%87%88%89%90%91%92%93%94%95%96%97%98%99%100%
347 Votes

Watercooler Poll

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

Olivia Wilde in Yigal Azrouel
Amanda Seyfried in Prabal Gurung