Kevin Federline recently discussed his ridiculous weight gain with Access Hollywood. K-Fed's weight gain happened at a good time; VH1 was casting for the new season of Celebrity Fit Club, and he never really seems to have a job.
But he cites different reasons for his Kirstie Alley-esque physique. K-Fed discussed his break up with Britney Spears, and said that, "once you get depressed, you don't really feel like doing anything."
From what I've seen, that's similar to how he feels when he isn't depressed. I thought when people went through break-ups they lost weight.
Especially if that break-up was, in fact, your meal ticket.