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Victoria Prince, Kevin Federline

Nathanael Jones/Miguel Aguilar, © PacificCoastNews.com

Kevin Federline is hanging another branch on his family tree.

Britney Spears' ex-hubby is expecting his first child with girlfriend Victoria Prince, a Britney/K-Fed insider confirmed exclusively to E! News on Monday. We hear that Prince is about five months along and the couple are "totally happy."

So the bump she's been sporting is of the baby variety!

A rep for K-Fed had no comment on the pending stork delivery.

The child will be Federline's fifth overall. He has two kids with Shar Jackson and two sons, Sean and Jaden, with Spears.

He and Prince have been seeing each other since late 2008.

Say what you will about Spears' former Chaotic costar: The guy has pulled plenty of Mr. Mom duty over the years, including when his pop-star ex was going through tough emotional times.

But, though they haven't been mister and missus for nearly four years, how does Spears feel about her hubby starting a family with another woman?

"She's focused on her work right now," says a Spears source. Incidentally, she's also been dating agent Jason Trawick for the past year.