kevinbeforeandafter062013.jpg Jenny Craig, help this man!

Kevin Federline stepped out to run errands in Calabasas today, and Britney Spears' ex-husband has gained so much weight that we barely recognized him!

The former backup dancer doesn't have a job that we know of, so we see no reason why he can't hit the gym and cut back on the junk food. You would think a father-of-five would be too busy running after his kids to pile on this many pounds!

Back when the Fresno native was dating our beloved Brit Brit he was so much hotter! K-Fed would show off his toned muscles in wife beaters and make all the ladies swoon!

K-Fat, please bring sexy back!