Kevin Federline: Being Fat 'Sucks'

Kevin Federline can thank the paparazzi for helping him realize it was time to lose weight.

The former backup dancer tells "Extra's" Mario Lopez it was when he saw a photo of himself in a magazine without a shirt on by a pool in Miami, he knew he needed to make a change. "I was like, 'Wow, this is really what I look like on someone's lens.'"

See the weight loss makeovers of 2009

Federline says in high school he weighed in at 130 lbs., but ballooned to 245 lbs. after he turned 30. Federline, finally ready to make the change and get in shape, signed up for VH1's "Celebrity Fit Club: Boot Camp." The show, premiering Feb. 8, features his fomer girlfriend and babymama Shar Jackson, Bobby Brown and Nicole Eggert.

"Looking at yourself fat ... it sucks," K-Fed confessed. He says smoking cigarettes and bad eating habits were part of his weight gain problem.

Federline, best known as Britney Spears' ex and father of their two children, also keeps music on his mind. He released his debut rap album in 2006 and hopes to record a second. Federline says, "I have been in the recording studio and I plan to come out with some music really soon."