This year, several of Instagram's big stars, including Kylie Jenner, Christina Aguilera, and Rihanna, 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, or a provocative mirror shot, 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!