Kevin Federline, U.S. star Britney Spears's ex-husband, is getting back into shape, People magazine reports.

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After being called "K-Fat" instead of "K-Fed" by some, "Kevin has lost 25 pounds, and is working on getting back into top shape," Federline's representative, Marilyn Lopez, told People.

Lopez said the former backup dancer, 32, is raring to get back to work. "He can't wait to start acting and dancing again, and going on auditions next year," she said.

"Kevin and Victoria are really doing great," a friend tells People, citing his relationship with former college volleyball star Victoria Prince.

"Although he and Britney don't talk much, they are co-parenting as best they can (and) working together to make the best decisions for their (two) boys."