There’s still excitement around Madonna, too, but that didn’t help her most recent album, “American Life,” which debuted at No. 1, then plummeted. (The album has sold only 578,000 copies to date, and a ho-hum Gap ad hasn’t helped matters.) It’s too soon to be sure how Britney’s new album will do, but in the meantime she’s staying busy weaving Madonna-esque mystique. In a recent interview on CNN, she spoke fondly of her girl-on-girl smooch before declaring her unwavering trust in George W. Bush and his war efforts. Sounds like somebody who isn’t quite sure who her audience is.