Kim Zolciak was spotted out in public for the first time since losing primary physical custody of her kids … amid her ongoing legal battle with Kroy Biermann.

The “Real Housewives of Atlanta” reality star kept her look casual but still luxe … rocking an all-black designer outfit.

She sported a fitted long-sleeve crop top, joggers and Balenciaga slides while moving through her day.

The Bravolebrity was seen taking phone calls while running errands around town … and later in the day, she was snapped picking up her kids from school.

It seems she’s keeping things low-key during the outing as attention around her personal life continues to build.

We broke the story … Kim has temporarily lost custody of the kids she shares with Kroy — the latest twist in their messy legal battle.

A judge had ruled on Kroy’s emergency motion and gave him primary physical custody of the kids. The ‘RHOA’ alum will have limited parenting time with their 4 minor children every other weekend.