In comparison, sister Kim Kardashian is estimated to be worth around $350 million.
How did Jenner make her fortune? Forbes conservatively values the company at $800 million, with an estimated $330 million in sales a year ago.
"Thank you @Forbes for this article and the recognition", added Kylie.
Within the next year, she's set to become the youngest self-made billionaire ever, besting Facebook founder Mark Zuckerberg and Snapchat king Evan Spiegel.
The youngest Jenner, who is on the cover of the August edition of the American business magazine, is on the "America's Richest Self-Made Women" list.
"I struggled for a minute with finding something to do on my own", she told Forbes.
England fans celebrate World Cup win over Sweden at IKEA
Sports analysts differently assess the teams ' chances of reaching the final of the world championship. Gareth believes, the fans believe, now it is time for the players to finish the job.
However, upon realising that she has a huge following on social media, Kylie says that helped her get easier access to her supporters, and maybe that's why her business is doing so well. The youngest of the KarJenners, she said she felt out of place trying to carve her own niche away from the show. When Jenner chose to go into the beauty business, and make a career out of her biggest insecurity, she already had a massive number of followers to sell to.
"Ever since I was in sixth grade, I would wear purple eye shadow", she remembers. (In 2015, she admitted to getting temporary ones.) So, the reality star chose to capitalize on everyone's obsession.
"Wow, I can't believe I'm posting my very own @forbes cover", she captioned the pic. "I don't want to do it with anyone else, '" Jenner said, adding that she used $250,000 of her savings from past modeling gigs to make her first 15,000 lip kits.
Kylie debuted Kylie Lip Kits in 2015 before relaunching in 2016 as Kylie Cosmetics. Forbes reports that revenue grew just 7% in 2017, with lip-kit revenue dropping an estimated 35%. However, mother Kris maintains that revenue is up "considerably" in the first six months of 2018 compared to past year, but it's an assertion that Forbes couldn't verify.
With Kylie making headlines for other reasons including giving birth to her and Travis Scott's first daughter, and more recently getting rid of her lip fillers, fans were completely unaware that the cosmetic queen was becoming one of the richest women in the America. Kris, however, said selling out is "always something that we're willing to explore".