He says the singer, who is just as famous for her massive hairdo as her music, is a "style icon."
Amy is also well know for her string of problems including drug and alcohol abuse and a battle with bulimia. However, this didn't seem to put Karl off.
His inspiration was clear at his fashion show in London last week. Models strutted down the runway with beehive barnets and clothes Amy wouldn't look out of place wandering the streets of Camden in.
The top designer even compared her to sixties French icon Brigitte Bardot, saying: "She is a beautiful, gifted artist. And I very much like her hairdo. I took it as an inspiration. Because, in fact, it was also Brigitte Bardotâs hairdo in the late Fifties and Sixties. And now Amy has made it her own style.
"So, when I saw her, I knew it was the right moment. Amy... she is the new Brigitte."
Female First - Jacqueline Farrer
Tagged in Karl Lagerfeld