Kevin Federline Victoria Prince practice baseball overweight fat hat pregnant Kevin Federline Victoria Prince practice baseball overweight fat hat pregnant

While Britney Spears and boyfriend Jason Trawick were in Vegas for the Billboard Awards, her ex Kevin Federline and pregnant girlfriend Victoria Prince were rooting on Sean Preston at his baseball game in Calabasas.

We couldn't help but notice the growing belly ... and we're not talking about just Victoria. K-Fed sure is living large these days!

Check out adorable Sean Preston dressed in his baseball uniform ... after the jump.