Kylie Jenner bares her behind in nearly-nude thong photo on Instagram

Kylie Jenner is back to baring her derrière!

After a brief hiatus from booty-centric Instagram shots (about three weeks), Kylie's rear end returned with a vengeance. The 19-year-old shared a revealing snap Wednesday: She's posed sensually by a large window, her face shrouded as she shows off a very, very small thong.

Kylie's as known for her unpredictable hair as she is for her bodacious bod, but in the latest photo, she's just rocking her natural dark locks. Just last week, she wore a platinum-blonde, chin-length wig to the Met Gala -- but it seems that was just for one night only.

Meanwhile, older sister Kendall has also been sharing a number of sexy photos. While Kylie was perched in her window, Kendall was out on an island vacation with Bella Hadid and Hailey Baldwin. The ladies all posted plenty of bikini-clad shots, including one where Kendall is seductively splayed across a WaveRunner.

Between all of these swimsuit shoots, we're definitely getting major summer vibes! No word yet if the Kardashian clan will spend Memorial Day together, but if they do, there's no doubt that even more body-baring pictures will be on their way.