This year, several of Instagram's big stars [1], including Kylie Jenner, Christina Aguilera [2], and Rihanna [3], have gone beyond the stage, screen, and red carpet to perfect their selfie skills and treat us to a bevy of sultry snaps. Whether it's a sexy bikini photo [4], or a provocative mirror shot [5], these stars definitely know how to work those camera angles. Brace yourself, because we've rounded up the sexiest female selfies of 2015, and things are sure to get steamy!