Janice Dickinson has often been referred to as the world's first supermodel and in this exclusive sneak peek of the next Oprah: Where Are They Now? we find out why.

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"There have been other models before me that have been great legends and iconic beauties, but back in 1979 when I was working my ass off doing editorial, runway, spokesperson, catalog and advertising, none of the other girls were doing that," Dickinson said. "I was doing every job that I could to get my hands on money, so I could have money."

At the time even her agent was concerned for her.

"She said, 'You are working night and day. You are going to get ill. Who do you think you are? Superman?'" Dickinson said. "I said, 'No, I'm Supermodel.'"

After her years dominating the fashion industry, Dickinson found a new audience as a judge on America's Next Top Model. While there have been many peaks in her career, she's also experienced some low points due to past struggles with substance abuse.

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Today, Dickinson says that she is "100 percent sober."

Tune in to Oprah: Where Are They Now? this Saturday at 10 p.m. ET/PT on OWN.