"I didn't expect anything. I did not foresee the future", she said. "But [the recognition] feels really good".
She is also declared as the "youngest self-made billionaire ever".
But the declaration has sparked outrage on social media by those who take issue with the term "self-made", claiming Jenner's heritage set her up for success. Self-made can also mean building a company or establishing a fortune on his or her own, instead of inheriting the fortune.
The top of this year's Forbes annual list had some familiar names, with Jeff Bezos, Bill Gates, Warren Buffett, Bernard Arnault, and Carlos Slim Helu made the top five. Besides, it's the title Mark Zuckerberg got at 23 and his story isn't almost as glamorous as Kylie's.
Travis Scott shares a post about Kylie Jenner
The rush of funds brought her to the billion dollar mark faster than Kylie Cosmetics but the achievement didn't draw as much attention as Jenner nearly making it.
John Collison, the co-founder of Stripe, is 28 years old and has a net worth of $2.1 billion.
"When you say self-made billionaire, I just thought she'd got it because her sister made a sex tape and that is why they all became hugely rich". And it was Kylie who successfully negotiated and partnered with Ulta, a chain of beauty stores that carry cosmetics, skincare brands, fragrances, and hair care products in stores that always include a salon.
Jenner founded her makeup empire, Kylie Cosmetics, in 2015. "I would have her at number four on the list of Kardashians, and the ones above her aren't much better". Previous year alone, her brand grew by an estimated whopping $360 million.
But while her eye-watering wealth isn't in dispute, many commentators have noted that Jenner hasn't exactly come from the average family.