Porizkova shot to fame in the 1980s and became one of the world's highest paid models, gracing the covers of the most high profile fashion magazines and spending seven years as the face of cosmetics giant Estee Lauder.
The 45 year old has stepped away from modelling in recent years, turning to TV instead with a regular role as a judge on America's Next Top Model and a stint on Dancing With The Stars.
Porizkova now admits she misses her days as a model and feels "sad" her beauty has faded.
She tells the New York Post, "Nothing ages as poorly as a beautiful woman's ego. When you have used your beauty to get around, it's like having extra cash in your pocket. I was so used to walking down the street and having the young guys passing by at least give me a flicker of a look. But once you're over 40, you become invisible. You're a brick in the building and it's sad. It just feels like the sun went down a little bit. It got a little cloudy outside."
But the former supermodel is adamant she would not consider cosmetic surgery to regain her youthful appearance, insisting her former catwalk pal Janice Dickinson looks worse since she went under the knife.
Porizkova adds, "She was one of the most beautiful girls you've ever seen in your whole life. Now she looks like a transvestite."