Chrissy Teigen, the swimsuit model engaged to singer John Legend, made an appearance on “Fashion Police” on Friday and stunned–and disgusted–the hosts with a rather personal note about herself: she hates wearing underwear, and goes without it. All the time.

“I just don’t like it,” she said, after revealing that she wasn’t wearing any at the live taping and was having trouble crossing her legs in front of the cameras without flashing everyone. When Joan Rivers asked what she does during…that time of the month, Chrissy said she doesn’t wear underwear then, either. Joan, ever the bashful one, asked whether it was a cork-and-duct tape situation, and Chrissy, who clearly doesn’t mind sharing her secrets, assured her it wasn’t.

“The string goes up the butt-crack,” she said, much to the shock of the audience. And, much to the dismay of co-host George Kotsiopoulos.

“Are we still talking about this?!” he cried. “Stop! Stop it!”

Watch Teigen bare all in the interview, where she talks about rap videos and tricks of the trade.