You might think Emma Watson has already lived a fairy-tale life,
what with starring since age 11 in the mega-successful "Harry
Potter" films. But it took her performance in the upcoming film
"The Tale of Despereaux" to make her a princess.  The 18-year-
old actress lends her voice to the charming animated tale (based
on a best-selling children's book) of a courageous mouse
(Matthew Broderick) who saves a princess in the most desperate
of times. MTV News caught up with Watson to chat about venturing
into non-"Potter" acting, why she might be moving to the United
States, and whether she'd ever take it all off for a role as her
friend Daniel Radcliffe did.  MTV: Apparently, you only work on
films based on beloved books.  Emma Watson: [Laughs.] There is a
bit of a pattern, isn't there? Who knows what's next?  MTV: Was
this project a no-brainer for you to sign on to?   MTV: I would
imagine all the green-screen work you've done in the "Harry
Potter" films helped you with this one.  Watson: Completely. The
key in wor