Also making Forbes' 2018 The Richest People in the World List is 28-year-old Snapchat founder (and Miranda Kerr's husband) Evan Spiegel, who's worth US$2.1 million.
Of her success, she added: "I didn't expect anything".
Jenner, the half-sister of Kim Kardashian West, said the recognition is a "nice pat on the back".
@YerrBoyJosh joked: "Kylie jenner at 21 is a billionaire off make up and her family name im bouta change my name to kardashian put on a wig shove a pillow where my ass is to look like one of them and drop some shit".
US House committee seeks Trump corruption evidence
ABC News has reached out to the White House for comment, but has not yet heard back. The White House confirmed Monday it had received a letter from Nadler.
Forbes has estimated the business, which is 100% owned by Jenner, turned over 360 million U.S. dollars (£274,118,400) over the past year from a majority of e-commerce revenue.
Jeff Bezos, 55, founder of Amazon, kept the top spot in the magazine's annual list of the world's dollar billionaires.
Insiders told TMZ Kylie saw the messages as "evidence" her beau had been unfaithful, but he insisted it was just an innocent flirt. The news that 21-year-old makeup mogul and reality TV star Kylie Jenner has officially entered the exclusive billionaires club is big news in the celebrity-loving circle.
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These may include Don McGahn, the former White House counsel, and John Kelly, Trump's former chief of staff. Democrats are now in control of the House of Representatives, with Republicans holding the Senate.
Kylie Cosmetics came into existence in the year 2015 and it comprises of all kinds of make-up essentials.
'I see Kylie Cosmetics going very far.
She is daughter to Kris and Caitlyn Jenner, both millionaires with wealthy networks, and has more than 175 million followers across all her social media. 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. Her lip kits were selling like hot cakes the moment it hit the market and she's been flying high ever since.
'I would have her at number four on the list of Kardashians, and the ones above her aren't much better, ' Piers decided as Susanna gasped. As per the global outlet, Kylie Cosmetics earned about $360 million in sales past year alone.
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She was reportedly at home with her husband, Dion , when she began complaining she couldn't breathe. TMZ reports that her husband called 911 and performed CPR before paramedics arrived.