Kylie Jenner Retains 'Forbes' Youngest <br />Self-Made Billionaire Title for 2020 Jenner made much of her fortune <br />from her Kylie Cosmetics empire. Last March, she overtook Facebook founder <br />Mark Zuckerberg to top the publication's <br />annual 'World's Billionaires' list. Jenner has managed to maintain her substantial wealth, <br />and as of November last year, she sold 51% of her <br />beauty brand to Coty Inc. for $600 million. The deal, which wrapped in January, now values her business at an estimated $1.2 billion. The sale, and still having a 49% share <br />in the business, enabled the 22-year-old <br />to retain her position.