“She did it every time she took a photograph.

It has to have the mouth open.”

Joy BeharshockedThe Viewaudience with a hilarious joke about the deep origins of the lateBarbara Walters' signature open-mouth smile.

The View, Barbara Walters

Joy Behar on ‘The View’; Barbara Walters.ABC; Jim Spellman/WireImage

“Barbara, she’s an amazing lady.

You look into the camera and go, ‘Ahh.’

You get the right kind of smile.

That’s the Barbara smile.

It stayed with me.”

“She did it every time she took a photograph.

It has to have the mouth open,” the 80-year-old joked.

“Well, those are from her porn days.”

CohostAlyssa Farah Griffinexclaimed, “Oh my God” as the audience laughed.

The Viewairs weekdays at 11 a.m. ET/PT onABC.