Which celebrity has maintained the longest continuous brand ambassador relationship with a single company?

Test your knowledge of iconic celebrity-brand partnerships in the world of pop culture! Brand ambassadors have become a crucial element in modern marketing strategies, creating memorable associations between celebrities and products. Some partnerships have become so successful they've redefined both the celebrity's image and the brand's market position. Can you correctly identify which celebrity has the LONGEST-running official partnership with their respective brand?

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George Clooney with Nespresso (since 2006)
Taylor Swift with Coca-Cola (since 2013)
Michael Jordan with Nike (since 1984, but became Jordan Brand in 1997)
Beyoncé with Pepsi (partnership ended in 2016)