Article continues below advertisementKristin Cavallari stripped down to a barely-there bikini during a luxury vacation.The reality star, 38, bared her backside while soaking in the sun in Cabo San Lucas on Monday, August 11.Cavallari turned around and flashed her butt to the camera as she sat on the edge of an infinity pool.Article continues below advertisementSource: @kristincavallari/InstagramKristin Cavallari showed off her figure in a skimpy swimsuit.She ran her hands through her soaked blonde strands and glanced off to the side in black sunglasses.