Here's the painful story behind Kylie Jenner's massive leg scar

Kylie Jenner is 20 years old, and worth $900 million. Forbes reported that she is likely to become the world's youngest self-made female billionaire. A lot of people scoffed at the "self-made" part, since she's from an extremely wealthy family with their own TV show. But no one can deny the beauty mogul has built a fortune. Fans are so excited for Kylie to enter the billionaire's club that they're even donating money to cover the last $100 million. Sorry, victims of Hurricane Maria - they're giving their cash to Kylie Jenner.

This month GQ magazine featured Kylie on their cover, even though Kylie's fans are way too young to know what a "magazine" is. The soon-to-be billionaire posed with her boyfriend, rapper Travis Scott. Together, they have a baby daughter Stormi, who I assume has the finest Gucci diapers and Prada bibs. In the sultry cover photo, Kylie wears a black bodysuit that shows off her legs - and prominently displays a huge scar.

In the behind-the-scenes video for the cover shoot, the scar comes up in conversation. Kylie quizzes Travis to see how well he knows her, a game that every boyfriend totally loves. Luckily, she starts with an easy question: What's the biggest scar on her body? "Biggest scar? On your leg," says Travis. "Which leg?" asks Kylie. "It's a bonus question." "Left," replies Travis. "He really knows my body," Kylie remarks.

Some fans hadn't noticed Kylie's scar before, and wondered how she got it. Did Kim Kardashian try to attack her, after getting jealous she's about to become a billionaire? That would make for an exciting episode of Keeping Up With The Kardashians, but Kylie's actually had the scar since she was a kid. In a 2011 Q&A, she told the painful story behind the accident:

"When I was about 5 my sister and I were playing hide and seek and I hid inside this really tall-enclosed gate. After a while when my sister didn’t find me I had to climb up on this sharp pole sticking out from the gate. I slipped and the pole went into my leg. I tried pulling away to get the pole out but it just tore through my whole leg. It’s smaller now though because I grew!"

That sounds like a pretty traumatic experience. To some people, scars are cool, badass badges of honor you can't wait to show off. To other people, scars are embarrassing, ugly marks of imperfection that remind you of something you want to forget.

It's possible to cover up scars with makeup or get rid of them completely with cosmetic surgery. But Kylie's decided to embrace it. In 2015, she wrote "I love my scar" on Instagram, sharing a photo of the blemish, arcing upward like a white smiley-face.

It's nice to know that even someone who's about to become a billionaire isn't perfect.