The world is used to seeing Tyra Banks as a sultry, beautiful supermodel, but in a bold experiment that is generating headlines from coast to coast, Banks went through hours of make-up and prosthetics to find out what it's really like to be overweight in America. The result: a 350-pound Tyra.

"It was one of the most heartbreaking days of my life," Banks admitted. "As soon as I stepped off the bus I saw three people turn and look right at my face. I was stunned."

The "new" Tyra went on three dates and two shopping trips, including a stop at a trendy Los Angeles store where stars like Paris Hilton, Carmen Electra and Lindsay Lohan like to shop.

"I felt the cold stares," Banks revealed. "And I even heard some snickering from people laughing. That was humiliating."

Believe it or not, Banks told us the dates went even worse. "One of the guys on the dates, I said, 'You know, as you can imagine, I have a hard time dating, especially blind dates because of my size.' And he said, 'Oh, I don't have to imagine. I have eyes.'"

See much more of this supermodel's bold and disturbing experiment, Monday on "The Tyra Banks Show."