I think that this is possibly the funniest movie I have ever seen. Robert Harling's script is near perfect, just check out the "quotes" section; on second thought, just rent the DVD, since it's the delivery that really makes the lines sing.
Sally Field gives a comic, over-the-top performance like you've never seen from her anywhere else, and Kevin Kline is effortlessly hilarious. Robert Downey, Jr. is typically brilliant, and in a very small role, Kathy Najimy is a riot as the beleaguered costumer. I was never much of a fan of Elisabeth Shue, but she's great here as the one *real* person surrounded by a bevy of cartoon characters on the set of "The Sun Also Sets" -- that rumbling you feel beneath you is Hemingway rolling over in his grave. Either that, or he's laughing really hard.
Five stars. Funny, funny, funny.