Kim Zolciak: My Daughter Is No Piece Of Work

Kim Zolciak is coming to her daughter's defense, denying rumors surrounding 19-year-old Brielle's face in a family vacay photo.

Kim tells TMZ ... Brielle's face has NOT been under a scalpel, and the ONLY work she's had are the lip fillers she got during a mother-daughter trip last year.

Kim deleted the IG pic with Brielle and hubby Kroy Biermann after trolls went off about Brielle's face ... which mom insists only looks different because of the angle, and Brielle's lack of eye makeup.

In her defense, Brielle does look a little different in this video from the same night.