Britney Spears' ex-husband owes $57,615.39 in back taxes.

A federal tax lien was filed against the 'Scream & Shout' singer's second husband Kevin Federline on February 14th, claiming he owes $30,517.16 for outstanding income tax bills from 2009 and $27,098.23 from 2010.

According to gossip website, the former back-up dancer's income came from a small part in straight to DVD movie 'American Pie: The Book of Love' and from his stint on the reality series 'Celebrity Fit Club' in 2010, as well as his hefty spousal support payments.

Britney and Kevin - who share two sons Sean Preston, seven, and Jayden James, six, - reportedly paid off a $37,712 income tax debt in December, which they both owed from 2004 when they first married.

The former couple - who divorced in 2007 after three years of marriage - resolved the debt, which was filed against them in November by the State of California.

It is unclear whether the 31-year-old singer - who recently completed her a season as a judge on 'The X Factor' USA for which she earned $15 million - paid the entire bill herself.