We all knew this was coming. On the heels of the premiere of Britney Spears' MTV documentary, the release of her album "Circus" and the announcement that she is going on a North American tour this winter, her ex hubby had to get his two cents in.

Kevin Federline is telling all to "People" magazine this week. K-Fed says money was no object in his custody battle with Brit. Hmmm...we're not quite sure we believe that.

The Fed-Ex also vowed to “spend every last dime” (of Brit's money) to make sure that sons Sean Preston and Jayden James were OK.

“That’s all that mattered. I didn’t know how much power Britney had. That really scared me,” he says.

Spears told MTV that things fell apart when K-Fed began focusing on his rap career. But he told the magazine he was more concerned with the children.

“Not that I ignored Britney, but my kids are always most important,” he says.

I have a feeling the mud slinging has just begun.