Chris Brown is the father of a nine-month-old baby girl with a 31-year-old former model named Nia, reports TMZ.

That's pretty crazy news -- especially when you consider that he's been dating Karrueche Tran on and off (but mostly on) for the last few years!

Brown and Nia are no longer romantically involved, and according to the website the two are "on very good terms." It's not known what sort of child support order has been worked out, but apparently 25-year-old Chris "is happy about being a father."

The funny thing is, just a few days ago the R&B bad boy had a chat with Power 106's Breakfast Club and revealed that he fantasized about impregnating both former flame Rihanna AND Karrueche! "I’m cool having a baby," he added. "I’m not cool with giving you half of what I’ve earned all my life. Prenups all that, it’s cool."

UPDATE!
Karrueche has commented on the matter ... and subsequently DUMPED Chris! She tweeted a few hours ago:
    "Listen. One can only take so much. The best of luck to Chris and his family. No baby drama for me. 👶."