Turns out we've all been wrong!
In a recent podcast with renowned fash photographer, Mario Testino, Kendall revealed that she went to high school with Bella and didn't actually become besties with Gigi until they started modelling together.
"Gigi and I just started getting close when we started modelling, but Bella and I were actually really good friends since high school, and hung out everyday in school before either of us started working," she said.
"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," she added.
Mind = Blown!
As the interview went on, Testino gushed about the young models.
"I've worked with you and Gigi quite a lot so to me, you and Gigi represent the now, this moment," he said.
True dat, Mario. True dat!
Ch-ch-check out the full interview here.