Kylie Jenner is officially the youngest self-made billionaire of all time, snatching the title from Facebook founder Mark Zuckerberg.

Jenner, 21, was finally given the title after months of speculation on Tuesday by Forbes as it unveiled its annual billionaires' list.

Amazon mogul Jeff Bezos remains the richest man in the world with an estimated fortune of $131billion. When his divorce to his wife MacKenzie is finalized, he will likely be knocked from the top spot.

Also on the list of young billionaires is Snapchat founder Evan Spiegel.

At 28, he has amassed a fortune of$2.1billion.

He, Jenner and John Collison, 28, are the only self-made billionaires on the young list this year.