Britney Spears' ex appears to have gained weight

All eyes were on Kevin Federline‘s expanding waistline when he stepped out on a golf course on Monday.

The rapper’s belly turned heads at the X Games Celebrity Skins Classic event in California.

Kevin, 31, who has two sons with his ex-wife Britney Spears, was joined by girlfriend Victoria Prince.  

SEE PICTURE Kevin Federline expands>>

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Alison Adey