Shouldn't you know, casting directors or directors themselves, you know actually cast people who can act. And when I say act, I don't mean act like a dumb blonde ditz (that gives all blondes a bad name).
Could they at least go for Mandy Moore who has like four movies under her belt and well she can act (IMPO). Hell critics don't pounce on Mandy b/c she's not an airhead.
As for Britney, her one movie I think tanked at the box office.
I have to say, what is the world coming too if they cast Jessica Simpson in a movie?
FYI: Jessica's ABC TV show that was in development where she would play a character just as airheady (made up word

) as her, did not get picked up for next season.