David Arquette — I’m Having Another Baby!

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David Arquette remains fertile … our sources has learned his girlfriend is pregnant.

Multiple sources confirm to our sources … David”s GF, Christina McLarty is in her 4th month.  McLarty has been on several entertainment shows, including “Entertainment Tonight.”

David and Christina have been on-and-off for 2 years.

David has been boasting to the crew of the movie he”s shooting in Vancouver that he”s going to be a daddy again.

As you know, David also has a 9-year-old — Coco – with ex-wife Courteney Cox.

David”s rep could not be reached for comment.