The Kylie Cosmetics businesswoman, who is the 27th richest self-made woman in the United States, covers Forbes' "America's Woman Billionaires" issue, which reports that the youngest member of the Kardashian-Jenner clan is worth an estimated $900 million — nearly three times as much as her famous older sister, Kim Kardashian, who's worth roughly $350 million.

Jenner's company has made a reported $230 million in net profit since its launch in 2016, when the reality TV star's original line of lip kits sold out within just a minute after going live online.

According to Forbes, Jenner, 20, is on the cusp of becoming the youngest billionaire in the world — beating out Mark Zuckerberg, who earned the title when he was just 23 — despite what the publication refers to as "tapering" sales.

"Kylie Cosmetics' growth is already starting to taper off: After leaping to $307 million in 2016, revenue grew just 7% in 2017, despite the addition of 30 new products," the magazine writes. "Forbes estimates lip-kit revenue dipped 35% from approximately $153 million in 2016 to $99 million in 2017. Still, Kris Jenner says revenue is up 'considerably' in the first six months of 2018 compared with the same period last year–a claim that Forbes couldn't verify."

Meanwhile, Jenner says that she plans on holding onto Kylie Cosmetics "forever," passing it on to her daughter Stormi one day "if she's into it."

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