"I want to be Ursula in 'The Little Mermaid,'" Lily James, the star of "Cinderella," confessed. "I don't know. Maybe I need to grow and get bigger tits, and then I'll do it."

Though James is basically a showbiz newcomer most known for her arc on "Downton Abbey" as Lady Rose McClare, she's got the casual candor of a veteran actor. Maybe she learned that from her august "Cinderella" costars Cate Blanchett and Helena Bonham Carter, who play her wicked stepmother and fairy godmother.

"Cate has been one of my favorite actresses of all time," James told us. "To watch her was amazing, how she transformed into this woman. It was intriguing."

Check out our interview with James where we discuss the movie's exceptional costumes, the difficulty of chatting with CGI mice, and why she's still never worn a glass slipper.