Which celebrity's 2018 Instagram post for Kylie Cosmetics reportedly generated $1 million in sales within minutes, establishing a new benchmark for influencer marketing ROI?

Celebrity endorsements have become a cornerstone of modern product marketing, with famous faces often transforming brand recognition and sales overnight. From Michael Jordan's game-changing Nike partnership to George Clooney's sophisticated Nespresso campaigns, stars have helped create some of retail's most memorable moments. Test your knowledge about one particularly groundbreaking celebrity endorsement that changed the landscape of influencer marketing forever!

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