Which celebrity's partnership with a loyalty program resulted in the highest documented increase in customer retention rates within the first 6 months of launch?

Celebrity endorsements have been a cornerstone of retail marketing strategies for decades, but their effectiveness varies widely. In today's digital age, the relationship between famous personalities and brand loyalty has evolved significantly. This trivia question explores how celebrity partnerships have shaped customer loyalty programs and their measurable impact on consumer behavior.

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Taylor Swift's collaboration with American Express Membership Rewards (27% increase)
Rihanna's Fenty Beauty partnership with Sephora's Beauty Insider program (42% increase)
Dwayne 'The Rock' Johnson's Under Armour Connected Fitness loyalty integration (35% increase)
George Clooney's Nespresso Club collaboration (31% increase)