Kendall and Kylie Jenner share 'alien sister' selfies -- see the pics!

Kendall and Kylie Jenner were totally twinning on social media on Tuesday, posting pics to Instagram showing off their uncanny resemblance to one another.

Kendall, 22, and Kylie, 20, both posted their own series of pics to their respective Instagram pages Tuesday evening. Kendall posted a more playful selfie, which featured the sisters smiling brightly, followed by two goofier pics of her looking bored with her head on her Kylie's shoulder, and one of her rolling her eyes. Kylie, on the other hand, posted a more sultry closeup selfie, showing the sisters giving a pouty look followed by one with Kendall giving a playful air-kiss.

"alien sister @kyliejenner" Kendall wrote on her Instagram page.

"love u sister @kendalljenner" Kylie wrote back on her own page.

alien sister @kyliejenner

A post shared by Kendall (@kendalljenner) on

love u sister @kendalljenner

A post shared by Kylie (@kyliejenner) on

Kylie had a pretty epic Tuesday, with the release of her Vogue cover story about her and her rapper boyfriend, Travis Scott. In it, the couple discuss cute nicknames for their daughter, Stormi, Scott's romantic overtures and the dreaded "Kardashian curse.".

Kendall's love life, on the other hand, has a few more question marks. She was recently spotted kissing Gigi and Bella Hadid's younger brother, Anwar, but sources close to Kendall insisted it was "nothing serious." The model and reality star has also recently been spotted out with NBA player Ben Simmons. And how much should we read into Kendall  dropping by to enthusiastically cheer on (rumored) ex-boyfriend Harry Styles at his concert?

See more photos of Kylie Jenner this year:

Kylie Jenner's sexiest Instagrams of 2018
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Kylie Jenner's sexiest Instagrams of 2018
t-minus two hours
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my heart
My new favorite at home self tan all the way from Australia @bondisands #ad
bday mood all month long 💙 ... can’t wait for this special collection for @kyliecosmetics to launch on AUGUST 6TH. Thank you @brendanforbes for these bomb pics for all my packaging!
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love u sister @kendalljenner
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heat wave
thanks @voguemagazine ✨
“your uber’s outside”
bright colors all summer long ❤️🧡💛💚💙💜
Koko Matte Lip ✨ @kyliecosmetics
left my designer for this @FashionNova fit 👌🏼
it was so nice meeting you guys today 💋 my San Francisco pop up is open for a few more days at 21 Grant Ave.. so don’t miss out! @kyliecosmetics
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that look because KOURT X KYLIE just dropped on the site 👀
MOMMYS ☺️.. oh and If you didn’t already hear.. we’re COLLABORATING and it drops in 4 DAYS! 😻 KOURT X KYLIE @kyliecosmetics
behind the scenes of the KOURT X KYLIE shoot wearing RAD on my lips launching in just 3 more days! @kyliecosmetics
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stormi strolls 🤑
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