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K-Fat no more!

Kevin Federline stopped to fuel up his SUV at a gas station in Calabasas yesterday, and Britney Spears' ex appears to have shed quite a few pounds recently!

So what is his trick to getting lean and mean?

"I keep getting lots of questions about the diet I am on. So here is the link. It's called the Fresh Diet," he tweeted recently.

We would guess that along with a healthy eating regime, running around after five kids has got to be good for calorie burning!