Which celebrity partnership with a major retailer led to their loyalty program gaining over 7 million new members in just the first year of the collaboration?

Celebrity endorsements and partnerships have become a cornerstone of retail marketing strategies. When famous personalities align with brands, they often bring their established fan bases and influence customer loyalty programs. This trivia question explores one of the most successful celebrity-brand collaborations that transformed a traditional customer loyalty program into a cultural phenomenon.

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Rihanna's Fenty Beauty with Sephora's Beauty Insider program
Taylor Swift's merchandise line with Target's RedCard program
Beyoncé's Ivy Park with Adidas' Creators Club program
Kanye West's Yeezy with Gap's Gap Good Rewards program