While Britney shines, Kevin Federline bites the dust. TMZ has learned that documents were filed last week with the L.A. County Recorder’s Office showing that K-Fed has been slapped with a federal tax lien. How much is that lien you ask? It just so happens to be in the amount of $17,969.81. This lien is for the period ending in December 2008, which was just a few months after his divorce from then-wife Britney Spears was finalized.