Article continues below advertisementHailey Bieber is keeping it cool, casual - and just a little bit daring.The model took to Instagram to drop a series of effortlessly chic photos, including a mirror selfie that instantly grabbed fans' attention. In the shot, Bieber posed in what looked like a bathroom, wearing a tiny white bralette that showed off her toned figure.Article continues below advertisementSource: @haileybieber/InstagramHailey Bieber shared new photos on Instagram.