Which celebrity's product line was initially dismissed as a vanity project but later became a billion-dollar beauty empire?

Beyond their primary careers, many celebrities have ventured into product development with varying degrees of success. While some celebrity products become passing fads, others transform into billion-dollar empires. This trivia question explores a famous product line that surpassed expectations and became a legitimate business success story, completely transforming how we view celebrity-endorsed products in the marketplace.

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Rihanna's Fenty Beauty
Jessica Alba's The Honest Company
Gwyneth Paltrow's Goop
Kylie Jenner's Kylie Cosmetics