KFederlineGolf022908_003.jpgem>Celebrity Fit Club success story, Kevin Federline's first thought when he saw these K-Fat pix wasn't, "I've got to lose weight," it was "they've been photoshopped!"

The formerly in denial star told Entertainment Tonight that seeing his big boy pix were "upsetting".

"I went through a lot of things and I definitely say that those things contributed to me gaining weight for sure," says Federline, referring to the "depression" he says he suffered after his split with Britney.

When shown a photo of himself on the golf course, Kevin said, "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."

At one point Britney's famous ex weighed as much as 240 pounds, but he seems to have shed some (if not most) of that for his recent interview (below).