Kevin Federline Expecting His Fifth Child: Source

Kevin Federline Baby No. 5 on the Way
Kevin Federline and Victoria Prince
Seth Browarnik/Startraks

03/29/2011 AT 01:45 PM EDT

It's Papa Zao time again for Kevin Federline!

The former backup dancer and onetime rapper is expecting his fifth child this summer – his first baby with girlfriend Victoria Prince, a source tells PEOPLE.

Federline is already a father of four: sons Jayden, 4, and Preston, 5, with ex-wife Britney Spears; and son Kaleb, 6, and daughter Kori, 8, with ex-girlfriend Shar Jackson.

This will be Prince's first child.

Federline, 33, and Prince, 28, a former professional volleyball player, have been dating for more than two years.

Kevin Federline Expecting His Fifth Child: Source| Babies, Kevin Federline, Individual Class

Victoria Prince and Sean Preston this week

Nathanael Jones / Miguel / Pacific Coast News

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