Kylie Jenner has become the world's youngest self-made billionaire at 21, according to Forbes magazine.

The cosmetics entrepreneur and reality TV star has surpassed Facebook founder Mark Zuckerberg, who was 23 when he reached a 10-figure fortune, the publication said.

Forbes has estimated the business, which is 100% owned by Jenner, turned over 360 million US dollars over the past year from a majority of e-commerce revenue.

Its success is also down to a new deal with American beauty chain Ulta, which sells Jenner's products throughout its 1,163 stores.

In a press release, Forbes wrote: "Jenner owns 100% of Kylie Cosmetics, the three-year-old beauty business that did an estimated $360 million in sales last year.

"Most of the company’s revenue comes from e-commerce, but the company also has a new deal with Ulta that put its goods in all the makeup retailer’s 1,163 U.S. stores. Jenner was ranked at number 2,057 on this year’s list."

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Jenner, the half-sister of Kim Kardashian West, said the recognition is a "nice pat on the back".

She rose to fame in her family's reality TV series Keeping Up with the Kardashians, in which she appeared from the age of 10, but in recent years has become a force in the beauty industry with her Kylie Cosmetics company.

Jenner launched the company in 2015 under the name Kylie Lip Kits, in reference to her popular lip products, before changing its name to Kylie Cosmetics the following year.

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