Hailey Bieber is a baddie. Bieber, 28, took to Instagram on Thursday, November 6, to show off her bikini body while celebrating Kendall Jenner's 30th birthday during a tropical getaway. While relaxing, the Rhode founder showed off a green bikini featuring a thong back with string straps that tied in bows at her hips. Bieber styled the number with a triangle cup top, complete with halter straps. The model made her look even more colorful by tying a purple bandana around her hair. She gave the camera a pout while showing off her natural beauty.