In the tearful chat, which will air on Monday (01Nov10), the Australia-born star reveals she once weighed just 82 pounds (37.1 kilograms).
She says, "It wasn't that I was proud of it, but it was certainly a recognition for my self-control. I definitely had some pretty amazing willpower to get down to 82 pounds. And that's what I was holding onto to. I didn't think about anything else."