Britney's New Song About K-Fed

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The only headlines Britney Spears and Kevin Federline have been making together lately has been in court, but it looks like Brit is planning on exposing her ex hubby in her upcoming album 'Blackout.'

A source tells People magazine that "one of the most personal songs" in Spears' upcoming album, which was written by Pharrell Williams, is clearly about how K-Fed betrayed her.

The track, appropriately called "Why Should I Be Sad," makes references to money, expensive cars and other women. "It just seemed that Vegas only brought the playa out of you."

What did she expect when she married someone who left his pregnant girlfriend for her? If he cheats with you, he'll cheat on you!