Before Her 18th Birthday, Flash Back to a Young Kylie Jenner's Spot-on Imitation of Big Sis Kim Kardashian

08/08/2015 AT 09:00 AM EDT

Kylie Jenner turns 18 years old on Monday, and with every year that passes, the birthday girl seems to be looking more and more like big sister Kim Kardashian West.

Kim recently shared an Instagram that blended Kylie's and her faces into one, and the resemblance – complete with long lashes, a plump pout and arched brows – is uncanny.

Despite their similarities now, Kylie wasn't always trying to emulate her big sis.

Before the days of sexy bikini selfies, lip fillers and engagement rumors, Kylie and her sister Kendall were just tweens getting busted for making fun of Kim's diva-like tendencies in an early Keeping Up with the Kardashians episode.

RELATED VIDEO: First Look at Kendall and Kylie Jenner's New Clothing Line

Happy (almost) 18th birthday, Kylie!
MORE ON: Kim Kardashian
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