Kim Kardashian demonstrates how to have the perfect cleavage!

We’ve all wondered how Kim Kardashian’s gravity-defying breasts stay in position in those cleavage-baring dresses she wears – but now we know how she does it!

The 35-year-old star has revealed her “secret trick” by sharing a pic of herself wearing nothing but duct tape holding her puppies in place on kimkardashianwest.com.

Throwback snap of Kim with tape. Photo: kimkardashianwest.com

"You tape them up so they're super lifted," she wrote. "It takes a little work, but trust me, it's all worth it, LOL."

"I've used everything from duct tape to packing tape to masking tape, and I think that the best I found is gaffer's tape. It sticks the best!"

But there’s no gain without pain!

Kim Kardashian. Photo: Getty

"Make sure you don't have any lotions or oils on when you're lifting your boobs up with the tape,” she adds. “Just brace yourself for when it's time to take it off, LOL."

Ouch!