Singer Katy Perry has revealed how she banned all heterosexual men from the set of her "California Gurls" video which premiered earlier this week, because she didn't want them seeing her naked.

Russell Brand's fiancee stripped off for the sexy new promo, which saw her lying nude on a cloud of cotton candy in one shot, while covering her breasts with cakes in another. And Perry made sure it was a closed set on the day of filming - except for girls and gay men.

She told MTV News, "The cotton candy clouds! I was naked. It was really fun to do. We had to do like a closed set because we didn't want anyone seeing anything. You weren't allowed (on the set) unless you were a girl or you're gay."