Since the Oct. 2 John Lennon tribute, we know Kevin Spacey can sing. Seems the Oscar winner is also fluent in at least one foreign language: In ''K-PAX,'' Spacey speaks in a supposed alien tongue that he and speech coach Jessica Drake invented. ''It's somewhat based in Click languages and some African dialects,'' says Spacey. ''I asked Jessica to put together an 11- or 12-syllable word that I could say all at once.'' He declines to translate. ''I can't reveal that,'' he says. ''It's better for the audience to come up with their own interpretation.'' Filmgoers may find planet K-PAX's language similar to the kooky chatter of Anne Heche's alter ego Celestia. ''I've always had a very strange bond with Anne Heche, and I never knew why,'' notes Spacey. ''Now it all makes sense. We're both from K-PAX!''


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