Jen Selter has a butt that defies all logic and physics. She arguably has the most famous butt since Kim Kardashian became a celebrity, accruing a following of 2 million on Instagram alone, and launching the hashtag #seltering, which refers to her signature move: Popping her butt while using various props to put her feet and hands on. Here, she demonstrates five moves that will help you get an ass like hers.