Kylie Jenner is slated to become the youngest billionaire in America thanks to her insanely popular lip kits. Her success even landed her on the cover of Forbes for their America's billionaire women piece.
Forbes referred to Kylie as a self-made billionaire but it seems not everyone agrees.
The success of her cosmetics has been attributed to her leveraging her massive online following and making a product for them. However, it can be said that Kylie wasn't really unaided given that she was already born into a wealthy, successful, and well-known family and basically already had a guaranteed customer.
However, if you look at the current youngest self-made billionaire, Mark Zuckerberg, who founded Facebook in his college dorm room is actually self-made given his more humble beginnings.