2:25 PM PT -- A source with direct knowledge of the production tells TMZ … the film is based on a book, which Sony owns the rights to. Tom Holland 's set to star in an upcoming biopic about Fred Astaire ... but the late Hollywood legend's widow says the movie never got the green light from Fred's estate. TMZ obtained a legal letter Fred's widow, Robyn Astaire , fired off to Amy Pascal -- one of the biopic's producers -- and Robyn makes it clear she hasn't authorized or granted permission for