Britney Spears' ex-husband Kevin Federline is about to tackle a new challenge -- his recent ballooning girth. The former backup dancer and rapper, who has been called K-OverFed -- a play on his onetime rhyme moniker K-Fed, has confirmed that he will be taking part in the next season of the VH1 reality competition 'Celebrity Fit Club.'

Federline will appear on the show alongside actress Shar Jackson -- his first wife who he left while pregnant in order to be with Spears. Other participants include Whitney Houston's ex Bobby Brown and former 'Baywatch' beauty Nicole Eggert.

Federline is no stranger to reality television. He appeared with Spears in UPN's reality show 'Britney and Kevin: Chaotic,' a short-lived masterpiece following the couple that we regret to have missed. MTV reports that Fed attempted another reality show focusing on his life with current girlfriend Victoria Prince, but there is no word yet as to the status of that riveting project.

The new season of 'Celebrity Fit Club' airs on Feb. 14, 2010. Get ready.