Jessica Simpson and Britney Spears; I think they look horrible as brunettes..?

who do you think should stay blonde always..???I also prefer Cameron Diaz with blond hair, but she still looks more or less ok as a brunette...PS and the other way around?? th e only actress I can think of who has changed haircolours and looks terrible as a blond is Anngela Jolie (she was blond in a movie)