I was reading an interview with the manager of the England rugby team during the current World Cup and was surprised to learn that he speaks Italian. There's always a chance that he was just taking the mickey out of the interviewer but it set me off on another tangent wondering which celebrities might have a surprising smattering of Japanese either because they spent time in Japan or else studied the language.
Several articles testify that Jimmy Osmond apparently speaks good Japanese. That seems possible because he had some hits in Japanese as a boy and he was the right age to be influenced by the bubble era.
The actor Edward Norton also picked up a bit of the language. Wikipedia says "Norton worked in Osaka, Japan, consulting for his grandfather's company, Enterprise Foundation. He also appeared in an ESL textbook, Only in America, used by Nova, a major Japanese language school". There's more detail in this Metropolis interview. Here he is giving it a thrash at a press conference:
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Anyone got any other ideas? I also recall reading that the actress Mira Sorvino studied Mandarin as her major so there might also be a few hidden Japanese speakers out there. It's probably not that easy, though, since few Westerners will have been in Japan without at least some of us knowing about.