A single from aspiring rapper Kevin Federline has hit the Internet, as the Internet wonders what it did wrong. "Y'All Ain't Ready"  an apt title if there ever was one  has Mr. Britney Spears crackin' on his detractors, on his mug being plastered on mag covers and on the relentless "Pavarotti," which, as K-Fed alleges, is slang for paparazzi. (I allege it's remedial English.) A sample lyric: "Back then they called me K-Fed/But you can call me Daddy instead"  an invitation to more "fatherless" kids out there than Kev would probably care to admit.