The Keeping Up With the Kardashians star, 17, shared a screenshot from an old episode of show Tuesday.
“I promise that I won’t grow up too fast,” reads the subtitle for the shot of younger Kylie.
The reality star cheekily acknowledged that she might have gone back on her promise when she captioned the Instagram, “Dammit, Kylie!” with a “crying tears of laughter” emoji Tuesday night.
Kylie was 10 years old when KUWTK premiered in 2007. Her every move has been documented by E! cameras – and the media – ever since.
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Kylie has also weathered speculation about her physical appearance, notably her perfectly plump lips, and recently confirmed they are enhanced with temporary lip fillers.
“I want to encourage people/young girls like me to be YOURSELF & not be afraid to experiment w your look,” she Tweeted in April.
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The teen will celebrate her 18th birthday on Aug. 10.