No, Jimmy's not really invisible (thank God!). He just is the voice of an Invisible (a tiny fantastical being) in his new film Arthur and the Invisibles. The animated story is about a 10 year old boy who goes on a quest to find some hidden treasure in order to save his grandmother's house from being demolished. Sounds sweet. As for Jimmy, well, we loved him in Fever Pitch and hope to see him in Factory Girl soon (if it ever comes out!).
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