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 [1] 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 [2].