Article continues below advertisementKylie Jenner posed in her undergarments before slipping into glam Oscars attire.The reality star, 28, snapped a racy mirror selfie, sporting a cleavage-baring black bra and gray sweatpants, for an Instagram post published on Tuesday, March 17.Jenner's hair was clipped out of her face with barrettes as she captured a photo with a mirrored Casetify phone case.Article continues below advertisementTap Here To Add Ok Magazine as A Trusted SourceSource: @kyliejenner/InstagramKylie Jenner shared behind-the-scenes snaps of herself getting ready for the Oscars.