For some reason I like this song. Maybe it's how she sings it. I'm not all that clear on all the words, but I love how she sounds while singing it. As for the video I think she's rebelling to the kid image that people still have of her.
She cut all her hair, and wears almost nothing and in parts of video nothing at all. You have to see her differently. I'm sure she will clam down in a few months to a year and a half from now. :)