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Ex on Kevin Federline: Fans Will Be “Very Shocked” By His Weight Loss

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For those flabbergasted by summertime photos of a dramatically heavy Kevin Federline, get ready for the next shock: a slim-again K-Fed, thanks to his participation in the next season of VH1's Celebrity Fit Club.

So says Shar Jackson — his ex-girlfriend and mother of two of his children, also a contestant on the next season of Fit Club, which premieres in January.

Related: From hunk to chunk: see how Kevin has transformed

"I think everybody will be very, very shocked to see the end results," Jackson told at Nov. 20's Home of the Holidays Gift Lounge event in L.A.

Shooting for the reality competition ended on Nov. 19, and Jackson confirmed to Us that she and Federline "both made it to the end." The one-time couple didn't team up or work out together on the show, the 33 year-old singer-actress said. "He was on his journey and I was on mine,"

Related: Remember Chaotic? Look back on reality TV moments from Britney and Kevin and other stars

But they certainly had reasons to bond: both "survived the Harvey [E. Walden IV] boot camp," she said of the show's hard-charging coach. "You can't even imagine the stuff that this man put us through . . . very painful!"

Related: K-Fed in cornrows?! See the worst male star hairdos ever

Outside their reality-show gig, Jackson says that she and Federline are "definitely still friends." Federline is father to her daughter Kori, 7, and son Kaleb, 5 — who have playdates with Sean and Jayden, Federline's sons with ex-wife Britney Spears.

Related: Crazier times: recap Britney and Kevin's messy court battles and other celeb feuds

"They're siblings," Jackson explained. "They're going to be related forever. There's nothing we can do about that so we make sure that they love each other and know each other and have a great relationship."

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