Hollywood actor John Cusack has leaped to the defence of Hilary Duff, insisting her transition from pop singer to movie star is a huge success. The pair appear together in upcoming movie War, Inc, but Cusack is exasperated by press scepticism about his co-star's acting abilities. He tells MTV, "The part was... she played a pop idol from central Asia. So, she was like a Hilary - but not Hilary, because Hilary is so classy - but like a real, and I won't name names, but a real slutty pop star. "Hilary is the opposite of that, of course. I think for her to play that, or to parody that, was really great. "I think probably people wouldn't know how talented she is. I mean, she's a great actress. I just spent the entire fall with her and she was a revelation every day. I don't think people know that yet, but they're gonna."