Kim Zolciak celebrates son's birthday amid bitter divorce... and claims kids heard ex having sex with new woman

Kim Zolciak's Ex Kroy Biermann Allegedly Brought NSFW Model on Kids Trip

'RHOA' Alum Kim Zolciak's Ex Kroy Allegedly Dated OnlyFans Model After Split

Kim Zolciak claims her kids can HEAR their father Kroy Biermann engaging 'in sexual acts' when at his home as bitter custody battle ramps up