Jenner, who turns 21 on August 10, 2018 currently worth $900 million according to Forbes Magazine.
The article also says that Jenner, in part, built her company by leveraging her huge social media platforms, which has been the key to its rapid growth.
The young Jenner outsources her production to an Oxnard, California-based manufacturer and sells it all through the online platform Shopify.
Unknown to many, Jenner's cosmetic company only has seven full- and five part-time employees.
In the interview with Forbes, Jenner said: "Social media is an amazing platform. I have such easy access to my fans and my customers."
The model, whose cosmetics line has accrued $630 million in three years, is yet to turn 21 who is two years from the age Facebook boss, Mark Zuckerberg, became a billionaire.
Mark Zuckerberg joined the world's richest billionaires at age 23.
According to a report by Buzzfeed, Jenner is likely to hit the milestone of having a net worth of $1 billion at age 21.
In the last three years, Jenner's fortune has surpassed of her older sister, Kim Kardashian West, who is worth a mere $350 million and the most popular of the Kardashian clan.