The beauty, a former judge on Tyra Banks' America's Next Top Model, is disgusted by ageing celebrities who go under the knife for vanity, and is holding the pair up as examples of what can go wrong.
Porizkova blasts the blondes in a blog post on Modelinia.com, criticising the pop superstar for her rumoured facelift and Botox procedures.
She writes: "Madonna no longer looks like Madonna: what started as a sexy, well-shaped, and somewhat hairy Italian girl has ended as a cool Nordic blonde... She is starting to sort of melt away into the stew of the famous women over-fifty-high-cheek-boned blondes-who-cannot-frown."
She adds of Hudson, who is rumoured to have recently undergone a boob job: "She just looks like any California blonde actress. Instead of enhancing, she has diminished herself."