Kim Kardashian -- It's My Real Ass ... No Ifs, Ands or Butts!

Kim Kardashian put all the rumors to rest that her most famous and biggest asset is fake ... by showing off an X-ray of her bootyful backside.

To end all talk of butt implants or injections, little sis Khloe Kardashian posted a pic of Kim and her electromagnetic badonkadonk on her blog.

We're glad all this is behind her.