Is Emmy Rossum in this movie?!
She's Bulma
IMDB.com seems to say that's just a rumor. They really should hire that little ho Jamie Lynn Spears. The role of Bulma wouldn't be too much of a stretch for her.
IMDB is a horrible source of information check out the set pics thread there's VIDEO of her in costume and they introduce her saying Emmy Rossum who plays Bulma