Nicole Kidman is known for her classy style sense, but at the 2012 Cannes Film Festival, where she promoted her new flick The Paperboy along with Matthew McConaughey and Zac Efron, the actress proved that the classic sheath can also be sexy! Nicole chose an orange red Antonio Berardi knee-length sheath with a fabulous side slit, then finished off with Manolo Blahnik peep toes and a gold Omega watch. While her exact dress isn't available, this red Antonio Berardi dress with a single side zip ($1,740) is equally stunning, especially since you can unzip it as much as you like. For something less pricey, try this Mango red slim-fit cocktail dress ($100). Or for an even sassier take on the classic sheath, get this Versace cutout red dress ($711, originally $1,105).