Britney Spears' Taxes Reunite Her with Kevin Federline

Britney Spears and Kevin Federline don't just share two beautiful children. They also share a more than $37,000 debt to the state of California.

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According to TMZ, the former couple owes a $37,712.71 lien to the California Franchise Tax Board for unpaid income taxes from 2004.It just so happens that 2004 was a memorable — and lucrative — year for Spears. Her 55-hour wedding to Jason Alexander was annulled, allowing the singer to marry Federline that fall. Spears also released her first fragrance Curious, a greatest hits album and her cover of Bobby Brown's "My Perogative." The singer also began her Onyx Hotel Tour that spring to promote In the Zone.

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Even Federline made some cash of his own, appearing in the hit dance film You Got Servedthat year.Spears' rep insists that the lien was an error and will soon be fixed.