K-Fed filmed in boxers with bulging beer gut

Kevin Federline has been filmed in boxer shorts with a bulging belly on the set of US reality TV show Celebrity Fit Club.

The out-of-shape former back-up dancer is set to appear on the weight-loss show alongside other celebrities, including former R&B bad boy Bobby Brown and Baywatch actress Nicole Eggert.

At the beginning of the show, K-Fed — Britney Spears' ex-husband — weighed in at 110kgs and made a joke about how he looked like a pregnant man.

K-Fed blamed his weight gain on the stress and depression he went though during his divorce from Brit, with whom he has two sons aged four and two.

"Me and Brit are good now — everybody knows I've had a tough road but I am happy where we are at now," K-Fed was quoted as saying by US Magazine.

"Everything we went through played a part in my weight gain"

Bobby, the former husband of Whitney Houston, admitted on the show that his belly showed how far he had come from his past as an R&B pin-up.

"I used to take off my shirt a lot. Now my six-pack is gone and this is the keg," he said.

K-Fed has not revealed how much weight he lost on the show but has been photographed recently looking much slimmer.