Kendall Jenner took a page out of her younger sister Kylie's book when she posted a revealing photo on Instagram on Tuesday. The supermodel shared a behind-the-scenes snapshot of herself twerking on a couch from a recent photo shoot. Kendall's butt is clearly visible in a revealing pair of black tights. "Flashback to shooting #HMBalmaination. practicing a little twerk," she captioned the shot. While Kendall usually keeps her Instagram photos fun and innocent, like this one that garnered the most likes in the app's history as of August, Kylie is usually the one to go down the sexy route. See Kendall's shot below, and then check out Kylie's raciest Instagram photos.