Which celebrity's 2013 endorsement of a language learning app led to a 50% increase in downloads and helped establish mobile apps as a legitimate language learning method?

Celebrity endorsements have significantly impacted the language learning product landscape. Famous personalities have helped transform how we perceive language acquisition tools, often turning niche educational products into mainstream successes. This poll tests your knowledge about one of the most influential celebrity endorsements in the language learning industry that changed market dynamics and consumer perception.

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Natalie Portman for Duolingo
Ashton Kutcher for Babbel
Novak Djokovic for Rosetta Stone
Zooey Deschanel for Busuu