I can't remember the specific quote, but if anyone read the interview Rolling Stone did with her a couple of months ago when she was on the cover, she apparently is a pretty tomboyish home girl-type and the glamming up she did for her videos was because of her record company.
Everyone takes a bad picture once in a while, and some of those UK rags are notorious for putting the most godawful, non-airbrushed, zits-and-all shots on their covers. They have some different standards for "cover material" than the US does, I think. If that pic had appeared on Entertainment Weekly, they'd have airbrushed the heck out of her and you certainly wouldn't be seeing those curly hairs at the top of her pants (ewww).