Which celebrity pioneered the 'direct-to-consumer' marketing model for their beauty brand by using social media metrics to determine product development rather than traditional market research?

Many celebrities have leveraged their fame to create successful product lines and brands. Behind these celebrity product empires are sophisticated marketing strategies that have transformed stars into business moguls. This trivia question tests your knowledge about how famous personalities have innovated in the product marketing space and created retail phenomena.

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