Kim Zolciak and Kroy Biermann are about to get under each other's skin under the same roof all over again -- 'cause she's on her way back to Georgia -- after some nasty new developments in their divorce.
Sources with direct knowledge tell TMZ ... Kim is flying back to Atlanta Wednesday after filming for MTV's "The Surreal Life" in Colombia over the past couple weeks. We're told she's in the air now, and, within hours, is set to be back home with Kroy and their kids.