Popsugar Fashion Oscars Sexiest Dresses at Oscars 2015 25 Looks From Last Year's Oscars That Practically Reinvented the Word Sexy February 26, 2016 by Aemilia Madden View On One Page Photo 20 of 25 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 20 Margot Robbie Margot Robbie went for a plunging neckline in this black Saint Laurent gown on the Oscars red carpet. Previous Next Start Slideshow Red CarpetAll AnglesAward SeasonOscars