Which celebrity's endorsement of an AI language learning app resulted in the largest percentage increase in new users within 24 hours of the campaign launch?

The field of computational linguistics and AI language models has seen remarkable growth, with celebrities increasingly endorsing specific platforms. These endorsements have significantly influenced public perception and adoption rates of language technologies. This trivia question explores how celebrity partnerships have shaped the language technology landscape and consumer behavior in this specialized industry.

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BTS's Jin for Duolingo (127% increase)
Emma Watson for Babbel (93% increase)
Trevor Noah for Rosetta Stone (189% increase)
Ryan Reynolds for Lingodeer (142% increase)