Kevin Federline went from being a back up dancer with a hot little body to a fat golfer who lays around and eats Doritos all day; but he's changing all of that. Kevin has lost some weight after competing on Celebrity Fit Club, and in an interview with Entertainment Tonight. he admits he didn't realize how fat he had become.

He initially believed the fat photos of him on the golf course had been Photoshopped. No dude, you really were that plump!

"When I saw this picture, I did not think that I was that big. I thought it was Photoshopped. You know? And, then I realized that I was just letting myself go."

His weight gain also impacted his time with his kids. Because he was so out of shape, he couldn't keep up with them.

"It was easier to eat more when they were younger because they weren't as active. Now all of them want to play sports, hit the T-ball and run around the backyard and ride bikes. I could barely make it up the hill on the side of my house."

Yay for Kevin losing weight! Although he lost some weight, he's still Kevin Federline - baby daddy to Shar Jackson and Britney Spears' kids.  Shar is on the new season of Celebrity Fit Club also, so it will be fun to see how the two interact with each other. The new season of Celebrity Fit Club premieres February 8.