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Kevin Federline has spent the past six months filming Celebrity Fit Club 7: Boot Camp. The 31-year-old dancer-rapper decided to join the cast after realizing that the photos he was seeing of himself on celebrity websites were not Photoshopped to make him look pregnant — they were really him.

Weighing over 240 pounds and hating his new media nickname K-Fat, he decided that a change was in order. He can’t say how much he has lost because of his contract with the reality show but the loss is significant. The positive change even helped him to score a movie role.

K-Fed gained notoriety while married to Brittany Spears and is currently in a relationship with Victoria Princepics here.

Season 7 will premiere on Monday, February 8, 2010 at 9:00 PM ET/PT on VH1. To promote the show, K-Fed sat down with ET this week to talk about his weight loss journey.

Actress Kirstie Alley will also chronicle her weight loss on Kirstie Alley’s Big Life.

More photos and the interview video below: