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Kim Zolciak 's in a serious relationship -- her first since splitting from Kroy Biermann -- though it's not without its own drama ... 'cause she's dating the guy whose estranged wife subpoenaed her in their own $100 million divorce proceedings.

Here's the deal ... a woman named Jillian Green sent legal documents to Kim calling on her to provide a deposition in her divorce case with Kyle Mowitz -- requesting communications between them, and other information. Gallery Launch Gallery Instagram

Sources with direct knowledge tell us Kim and Kyle are an item, which explains her connection to the divorcing couple.

We're told Zolciak and Mowitz started dating in the spring 2025, in April or May. The two are very happy together -- and their relationship's super serious ..

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