The 25-year-old "Fancy" hitmaker said she thinks Schon! magazine were wrong to reduce the width of her silhouette and make her look less curvy than she really is, reported Femalefirst.
The star - who is engaged to Nick Long - replied to a fan who described the pictures as her "best shoot by far".
Iggy replied, "Love it, but I much prefer the picture before they photoshopped my thighs and hips to seem skinnier."
And when quizzed on why the picture was touched up, she replied: "No clue - but I'm very happy with my body the size it is and prefer it that way.