Katy Perry wants to kiss Natalie Portman.

The pop star - whose most famous hit is 'I Kissed A Girl' - has a crush on the 'Other Boleyn Girl' actress and thinks it would be incredible to lock lips with her.

She said: "I used to want to kiss Megan Fox, but now she's married and I'm not so sure about that anymore. Probably Natalie Portman now -she's hot and smart."

Although she would happily kiss Natalie, Katy wouldn't be comfortable posing naked for Playboy magazine.

The 25-year-old singer is happy to squeeze her sexy figure into skin-tight latex dresses but isn't prepared to expose it to the world.

When asked if she would strip off for the men's publication, she said in an interview with YouTube: "I think I would probably say no because that's like showing all your cards and I always want to keep a couple of aces up my sleeve and, plus, I think there's a fine line between being a tease and just giving it away. I like to be considered more of a tease, so unfortunately guys you're never going to get it."

Katy feels happier with her body now than ever before and credits her relationship with fiance Russell Brand for her confidence.

She explained: "I'm very comfortable with my body now, you know, I'm 25 and I'm like, 'OK this is what I've got.' And of course I'm very loved-up which helps."