Which famous polyglot celebrity's endorsement helped Duolingo achieve a 40% increase in new users in 2019?

Language learning and linguistic software companies often seek celebrity endorsements to boost their visibility and appeal. Behind these partnerships are fascinating stories of how famous personalities connect with language products. This trivia question tests your knowledge about a notable endorsement that significantly impacted a language learning platform's growth and brand recognition.

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Natalie Portman (speaks 6 languages including Hebrew and Japanese)
Trevor Noah (fluent in 8 languages including Xhosa and Afrikaans)
Shakira (speaks 6 languages including Portuguese and Italian)
Mark Zuckerberg (studied Mandarin and developed his own language learning method)