Calvin Klein has revealed that his professional relationship with Kate Moss was anything but a walk in the park, calling the British stunner a “difficult” person to work.

The 67-year-old designer – revered for his controversial promo campaigns — has confessed that Kate was not exactly his favorite person when he cast her to appear alongside Mark Wahlberg in a series of advertisements for CK Underwear in the early nineties.

Klein says that while Moss was “a great model,” she was also a “difficult” person to team up with.

“It didn’t go too well. She didn’t like him at all. He was a pleasure. I have worked with so many women, great ones, and Kate was always difficult…..”