Photo: Getty Images

Since she moved to America in 1986, Naomi has defined what a supermodel is alongside fashionistas like Cindy Crawford, Claudia Schiffer, Christy Turlington, Linda Evangelista, Stephanie Seymour and Tatiana Patitz.

Now, after 25 years in the business and days before her 40th birthday, Naomi says she still doesn't recognize how beautiful she is.

"The aging process to me, I don't care about the skin, what it looks like. For me, now, what's important is the inside," she says. "And to come to that peace where it's okay, I may look good. But I need to look the same way on the inside. That's what I'm trying to achieve."