Check out the progress that Kevin Federline has made so far during the filming of VH1′s Celebrity Fit Club. Sources report that he’s lost over 30 pounds already, which has prompted speculation that he fattened himself up for the show. You know, that whole theory that it’s easy and fast to lose a huge amount of weight that is unnatural to your body. Like shedding baby weight.

Looks like we can’t call him K-Fat anymore. Damn, that was funny.

Kevin Federline weight loss1

We can confirm that Kevin Federline will reunite with his pre-Britney ex Shar Jackson on Celebrity Fit Club 7. Rounding out the cast include King of R&B Bobby Brown, former Baywatch babe Nicole Eggert, ex-Skid Row frontman Sebastian Bach, High School Musical’s Kaycee Stroh, Project Runway Season 1 winner Jay McCarroll and Bad Girls Club alum Tanisha Thomas. Dr. Ian Smith and Harvey Walden will return to the panel with a new life coach: Rhonda Britten. Filming for the new season is underway, and it is expected to air in early 2010.