Kendall Jenner Twerks On Top Of Sister Kylie — Who Freaks Out: Watch

Kendall Jenner is probably the most reserved of the ladies in her family, but even she lets loose every once in a while! The 20-year-old hung out with little sis Kylie on Jan. 4, and a friend caught her totally twerking on camera. You have to see Kylie's priceless reaction! Even Kylie Jenner, 18, wasn't expecting this! The reality star was caught completely off guard when her sister, Kendall Jenner, 20, twerked right up on her during a night out on Jan. 4...and it was all caught on video. Watch the whole thing go down right here!

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Kendall Jenner Twerking Kylie Jenner
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Image Credit: Courtesy of Instagram

Kylie documented a majority of the girls’ night out on Snapchat, but this one video caught our eye above the rest. In the quick clip, the supermodel shakes her booty right into her little sis’ lap, and while the 18-year-old is all about it at first, she can’t help but widen her eyes in surprise as Kendall really starts getting into it. Hey, we don’t blame her — we’re not used to seeing Kendall loosen up this much, either!

Both girls looked fairly casual for their night out at what appears to be like a club, with Kylie showing off her amazing figure in a tight white shirt tucked into high-waisted black pants and Kendall in black leggings and a loose-fitted, long-sleeved shirt, which she paired with a Yeezus hat (because, duh). We’ve seen these two having some issues on the current season of Keeping Up With The Kardashians, so it’s great to know that they’re still super tight and hanging out with each other!

The ladies’ reunion comes after they spent New Year’s Eve apart…with their respective guys, of course. Kylie headed to Mammoth for a snowboarding trip with her friends and Tyga, 26. while Kendall really got people talking thanks to her romantic vacay in St. Barths with ex, Harry Styles, 21. Although they haven’t been linked since the beginning of 2014, the pair seemed beyond into each other, packing on major PDA while aboard a yacht. Literally, we’re still not over the cuteness!

And Kylie is just as on-board with the romance being back on as we are! “[She] loves that Kendall’s finally got herself a man! That way, Kendall can stay out of Kylie’s relationship and tend to her own garden, so to speak,” an insider told HollywoodLife.com EXCLUSIVELY. “Kylie hopes this last and that Kendall has her priorities straight in her romance with Harry.” We hope so, too!

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HollywoodLifers, what do you think of Kendall twerking? Were you as shocked as Kylie was?!