Topless and a thong: Kendall just got VERY raunchy on Instagram

Is Kendall Jenner taking a leaf out of Kylie's book?

The 19-year-old model usually keeps  her top half relatively covered up on Instagram, but today she left very little to the imagination. Kendall is the current face (and body) of Calvin Klein underwear, and earlier on she shared a seriously sexy snap from the most recent shoot:

The black-and-white photo shows a topless Kendall with her back to the camera, wearing nothing but a semi-sheer thong. "Little tease at the new @CalvinKlein underweear #MyCalvins" the Keeping Up With the Kardashians star wrote next to the risqué image, taken by photographer Mikael Jansson.

Other shots from the campaign show Kendall in a lacy black bra and pants:

Speaking about the sultry photoshoot to Women's Wear Daily, Kendall said it was "super fun," adding, "Every girl loves posing in her underwear. It’s always fun to do that." 

Of course, this isn't the first time Kendall has stripped down for a shoot, but even with her GQ spread back in April, she kept things a little more low-key:

Looks like Kim's little sister is growing up fast.