Kevin Federline, Jon Gosselin and More Famous Fathers Who've Packed on Pounds

No, they didn't birth a baby (or eight). They didn't suffer through the morning sickness or the ankle swelling; there were no inexplicable food cravings or a C-section.

Kevin Federline and Jon Gosselin could benefit from becoming gym buddies.

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But damn if these celebrity dads don't look like they've been incubating for nine months.

Kevin Federline, formerly K-Fed, newly anointed K-Fat, is the latest famous Mr. Mom to tip the scales -- at least, compared to his pre-baby body.

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Federline caught the eye of his ex-wife, Britney Spears, when he worked it out as the resident hunk of her backup dance crew. Now, his former six-pack abs have gone to flab, and the 31-year-old father of four can barely handle 18 holes of golf, let alone a sweaty stage routine.

According to Usmagazine.com, instead of traversing the greens at a recent celebrity golf tournament, Federline opted for an even lower-impact workout -- smoking cigarettes and sipping cocktails in the shade with girlfriend Victoria Prince.

"He used to be extremely active, but now he has all this money because of his ex-wife, and he doesn't have to pound the pavement anymore," said Natalie Thomas, Us Weekly magazine's deputy news editor. "There's a lot more alcohol involved and a lot less moving around."

Federline's been packing on the pounds for more than a year now. Last March, Shar Jackson, the woman he was engaged to pre-Britney and with whom he has two children, came to his defense, telling Usmagazine.com, "It's daddy weight! When you are a full-time parent, sometimes you can't focus on you."