She really showed everyone!

Kylie Jenner, 21, has surpassed Mark Zuckerberg as the world's youngest billionaire, thanks to her wildly successful Kylie Cosmetics range, Forbes officially announced today. That's quite the accomplishment! For comparison, Zuckerberg made his first billion off Facebook when he was 23-years-old.

"I didn’t expect anything. I did not foresee the future. But [the recognition] feels really good. That’s a nice pat on the back," she told the mag after learning the news.

The reality star couldn't help but credit her fans for her success, either.

"It’s the power of social media. I had such a strong reach before I was able to start anything. I see [Kylie Cosmetics] going very far. I work really hard," she added.

As for the others?

Miranda Kerr's husband Evan Spiegel, 28, took the #6 spot for "youngest billionaires" with $2.1billion from Snapchat. Amazon's Jeff Bezos remains the richest man in the world with a net worth of $131 billion, with Bill Gates trailing behind $96.5 billion. Donald Trump also made the cut, as the 715th richest person in the world with $3.1 billion.

We bet Kimmy K is insanely jealous of her little sister right now!