Chris Brown's adding a lil' Breezy to his family ... TMZ has learned.
CB and and his ex-girlfriend, Ammika Harris, are expecting their first child together, and sources in the know tell us ... it's a boy.
The child will be Ammika's first, and a half brother to Brown's 5-year-old daughter, Royalty, whom he shares with Nia Guzman.
We're told Chris and his baby mama -- who are no longer together -- are getting along well. She's happy with the way Chris is treating her ... financially, medically and emotionally.
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News the former couple is having a child together broke in June, but fans had their suspicions as early as May 8 when Chris commented on one of Harris' photos, "BM BAD" ... the BM assumed to be code for "baby mama."