IRS to Kevin Federline — You Owe Us $57,000 … Pay It Now

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Uncle Sam has a bone to pick with Kevin Federline — and no, it”s not for releasing “PopoZao” — it”s because the IRS says K-Fed still owes back taxes … to the tune of $57,615.39.

A federal tax lien was filed against Britney Spears” baby daddy on February 14th … claiming K-Fed has outstanding income tax bills for the years 2009 ($30,517.16) and 2010 ($27,098.23).

In case you”re wondering how K-Fed made money in those years — besides those hefty spousal support payments — in 2009 he had a bit part in American Pie: The Book of Love (straight-to-video) and in 2010 he starred in “Celebrity Fit Club” on VH1.

Probably not making him money … PopoZao. Memba” that