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Get ready for a slender Kevin Federline, promises his former baby mama, thanks to his participation in the upcoming season of VH1’s Celebrity Fit Club.

Can he credit Ashley Greene diet tips?

Shar Jackson, his ex-girlfriend and mother of two of his children, also a contestant on the next season of Celebrity Fit Club, says people will be shocked.

“I think everybody will be very, very shocked to see the end results,” Jackson said, noting that she and her dirtbag ex “both made it to the end.”

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Celebrity Fit Club spoiler alert!

The one-time couple didn’t team up or work out together on the show, the singer-actress said. “He was on his journey and I was on mine.”

Below, Kevin made an epic journey indeed, from the golf cart to the first tee, with a possibly pregnant Victoria Prince loyally by his side …

K-Fed and his new girlfriend on the links.

Outside their reality-show gig, Jackson says she and K-Fed are “definitely still friends.” Kevin 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.

“They’re siblings,” Jackson explained. “They’re going to be related forever.”

Sage words from their mom: “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.”