Which famous polyglot celebrity's endorsement helped Duolingo achieve a 40% increase in downloads in 2019, after they revealed they used the app to learn Portuguese?

In the world of language learning and linguistics, celebrity endorsements have become a powerful marketing tool. Language learning apps, translation services, and linguistic software companies often partner with famous personalities to boost their brand visibility and appeal. This trivia question explores a notable celebrity endorsement that significantly impacted a language technology product's success and brought linguistics into mainstream conversation.

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Natalie Portman
Mark Zuckerberg
Shakira
Trevor Noah