Katy Perry to Us Weekly's fashion police: bring it on! "I'm definitely going to be on the worst-dressed lists," she says in the newest issue of Page Six magazine, which hits stands Dec. 7 in the Sunday New York Post. See the worst dressed stars of 2008! "I just want to have fun," she says of her style. "I don't take my life too seriously." But, "as much as I am cheeky and full of opinions,...