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Kim Zolciak, star of Real Housewives of Atlanta, is now the proud mom of baby Kroy.

The blonde reality star is engaged to the baby's 25-year-old daddy, Atlanta Falcons player Kroy Jagger Biermann. Zolciak tweeted the following:

    "[Kroy] and I are happy to announce the birth of our son. Kroy Jagger Biermann is healthy & beautiful We are so in love!"


Zolciak already has two children from a previous relationship ... Brielle, 13, and Ariana, 9. Kim and Kroy have been together since August 2010 and announced their engagement earlier this year.

See a photo taken a few months ago of the couple showing off Kim's baby bump ... after the jump.