Victoria Prince

With their bellies in tow, Kevin Federline and his very pregnant girlfriend Victoria Prince made their way to the movies in Calabasas on Wednesday afternoon. This will be Kevin's fifth child.

Kevin Federline is gearing up for baby #5 -- and unlike the two kids he had with Britney Spears ... this one's a girl. According to Kevin's now pregnant girlfriend -- ex-pro volleyballer Victoria Prince -- they're naming her Jordan ... because when the couple was deciding on names, they weren't…