Bellz recently spoke to InStyle, and revealed the story.
"I met her for the first time seven years ago over Twitter. That was before we started modelling; I was probably 14 or 15," Bella said.
"We met up and had sushi, and now we're best friends. She's a pretty significant human I met online," she continued.
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So how are they actually "related"?
Bella's mum, Yolanda was married to music composer David Foster, who is the stepfather of Kendall's stepbrothers, Brandon and Brody Jenner.
Wehhh. Our brains.
David Foster was previously married to Lisa Thompson (Brandon and Brody's mother), before Yolanda.
What a complete wig out. The Kardashian/Jenner family tree is even more complicated than we could ever imagine.
It may even surprise you that Bella and Kendall were friends before Kendall and Gigi.
Last month Kendall revealed to Mario Testino in a podcast that, "Bella and I were actually really good friends since high school, and hung out everyday in school before either of us started working.
"It's just funny because a lot of people don't know that Bella and I have been friends for like five or six years."