Kylie Jenner is known as a reality TV star and a model. But the Keeping Up With the Kardashians star is, at, 20, also an extremely successful businesswoman and is on course to become the youngest self-made billionaire ever, reports Forbes, which estimates her current fortune at $900 million. Most of that comes from her thriving Kylie Cosmetics company, which she started just two years ago. The business has only seven full-time employees and she owns 100% of it, though "momager" Kris Jenner takes a 10% cut for handling the business side of things. Jenner, who had a baby girl in February, will beat Mark Zuckerberg's record if she makes her first billion before she is 23. Half-sister Kim Kardashian West's wealth, meanwhile, is estimated at $350 million, USA Today notes. (A single Jenner tweet was blamed for wiping $1.3 billion off the value of Snapchat.)