Kevin Federline to enter 'Celebrity Fit Club'

Kevin Federline is all set to silent his weight gain critics as he prepares to slim down on VH1's Celebrity Fit Club.

The father of four, who was married to Britney Spears, is joining the cast of the seventh season of the fitness show, a rep for VH1 has confirmed.

Joining K-Fed on the show will be his ex-girlfriend and the mother of two of his kids, Shar Jackson, reports People.

Federline, a former backup dancer, was heavily lambasted in the press for putting on weight since his split from Spears three years ago.

The latest season of Celebrity Fit Club will premiere on VH1 Feb. 14, 2010.