Kim Zolciak Confirms She's Done with 'Real Housewives of Atlanta'

Kim Zolciak's not mincing words -- she says her time on "Real Housewives of Atlanta" has come to an end ... and she's not leaving the door open for a return.

We got Kim and her hubby Kroy Biermann at LAX Saturday, and asked if reports of her leaving the show are true ... she tells us they are. Kim says it's too much stress ... and she's "never, never" doing it again.

As you know ... Kim's an OG on 'RHOA' but left for a few seasons to star on her own Bravo spin-off, "Don't Be Tardy," which -- as she reminds our guy -- is still going strong.

She returned for this season of 'RHOA' but clearly didn't have a good time ... most likely due to her ongoing feud with longtime rival, NeNe Leakes.