Here's a novelty: Playing With Fire is a concept album about squandering Britney Spears' fortune. K-Fed boasts about Louis Vuitton, ''fill[ing] the Lamborghini up with shopping bags,'' carrying ''10 G's in my pocket, 5 in my hand...'' and the figures get bigger: ''Who told this bastard that he can't rap? I got 50 mil, I can do whatever I want!'' Other rappers might hesitate to brag about marrying into bling, but Federline isn't self-conscious about it. Or anything: ''This marijuana got me heavily sedated/I'm Kevin Federline, America's most hated.'' Word.