It looks like there鈥檚 some previously unknown tension between the Kardashian-Jenners. Hot on the heels of Kim Kardashian鈥檚 reveal that little North doesn鈥檛 like her brother Saint, Kylie Jenner has just made a totally brutal admission about her big sister, Kendall Jenner.

Opening up on Life of Kylie, the 20-year-old revealed that there鈥檚 way more tension between herself and her sister than we鈥檙e shown on the family鈥檚 reality show, Keeping Up With the Kardashians. According to the Daily Mail, during the promotional teaser for Sunday鈥檚 episode of the younger Jenner鈥檚 new reality series, she went as far as to say, 鈥淜endall and I, I don鈥檛 think we鈥檇 be friends if we weren鈥檛 sisters.鈥

That revelation may come as a shock, given that the two usually seem to be besties while the cameras are rolling. Perhaps they鈥檝e just gotten used to playing nice when non-family members (and film-crews) are around. Or maybe their sisterly friendship is as genuine as it seems, but simply wouldn鈥檛 have happened organically.

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Whatever the specifics, their complex relationship doesn鈥檛 stop them from doing things that normal siblings do, like raid each other鈥檚 closets. Though, as far as Kylie is concerned, she鈥檚 WAY more generous than Kendall.

鈥淚 let her borrow whatever she wants,鈥 Kylie Jenner said of her older sis, adding, 鈥淎nd then I go over there [to Kendall鈥檚 house], and I鈥檓 like: 鈥楰endall, I need a pair of sweats to go home,鈥 and she鈥檒l give me the most uncomfortable old underwear, the worst sweats you鈥檝e ever seen, and anything that鈥檚 so bad and old and small. And I鈥檓 like: 鈥榊ou鈥檙e so mean.鈥欌

Okay, so maybe we get where the tension comes from. Sisters *can* definitely be a pain (sorry, sis!). Also, we鈥檙e not sure we needed to know that these two share underwear. (Just sayin.鈥)

Do you think you鈥檇 be friends with your siblings if you weren鈥檛 related? Let us know @BritandCo!

(Photos via Jamie McCarthy/Getty Images for Harper鈥檚 Bazaar/Getty)