Okay so you know where we are going with this one. We are of course talking about low back dresses. The kind of design that's a superbly sexy yet still sophisticated way to reveal some skin. Anne Hathaway's pink Prada Oscars dress looked quite prim and proper from the front, but as soon as she turned around, the cross over straps and ribbon detail at her lower back was quite the pièce de résistance of her dress design. Rita Ora opted for something very similar in peach at the Birts. For the best selection of sexy back dresses, shop the look at Nelly below!