Kate Moss has appeared in tons of Calvin Klein ads in the past, including ones that were considered controversial and too racy. One in particular was her 1992 advert with actor Mark Wahlberg, who at the time was still going by his rap name, Marky Mark. It's one of the most memorable CK images, no doubt. And though the designer himself has expressed his admiration for Moss—he gave her a job even after the cocaine scandal—he recently admitted that he "had a tough time with her."

"Yeah, from the very beginning. She had gone through some difficult times, and it sometimes came through in the work and in the attitude ... She ended up being really great, though. But the earlier stuff was part of that whole opposite wave ..." he told Marc Jacobs, who sat down with Klein for Interview

Moss had a nervous breakdown at the shoot, Wahlberg says the ad is one of the most embarrasing moments in his life, and Klein had a difficult time working with Moss. Oh, the things that go on behind the scenes.

[via Interview]