The Canadian high school teacher who goes to work wearing size Z prosthetic breasts incredibly claimed they’re not fake — and denied being the person photographed leaving home without them — but acknowledged she can’t prove it.

“I’m not wearing prosthetic breasts. These are real,” Kayla Lemieux told The Post during an exclusive interview Saturday.

Lemieux — who wore woman’s clothing, with a blond wig, makeup and her enormous breasts — said she’s “not a transgendered person” but was born “intersex.”

“My condition is classified as gigantomastia, which can also be referred to as macromastia or breast hypertrophy,” Lemieux said during a sit-down at a cafe in Burlington, near Toronto.

“It’s rare, there’s no doubt about it. It affects women on a very rare basis, but in my case, I believe — and my doctor thinks — because I have XX chromosomes as well, that has something to do with it, and hormone sensitivity to estrogen has caused it.”

It’s a rare condition called Breastium plasticus fetishitis you freak.