The model and actress posed fully nude for Exhibition magazine in a series of shots by Ben Hasset, which eventually show her covered in lipstick.
According to The Sun, a friend of Brook's said of the full-frontal shoot: "We couldn't believe it. Kelly always does tasteful, sexy photos but these were really full-on. We had to do a double-take - we were convinced they were fake."
A publicity statement from the magazine read: "This first issue is devoted entirely to lipstick shown as it is, but also in a feminist, industrial, and political sense."
Brook last year stripped off for Piranha 3D and a Playboy shoot, later quipping that she was having a "naked month".
> Kelly Brook shakes her bum in 'Skins'