Pop beauty Katy Perry says her signature raven locks are all thanks to her desire to look like Madonna.

The stunning songstress is the cover star for July's American issue of Vogue magazine and to promote the prestigious honour, Perry has released a short video.

In the promo, Perry - who is famed for her ebony locks - revealed how trying to emulate Madonna's platinum style resulted in her signature look.

She explained: ''I've been dying my hair black since I was 15. The whole reason I dye it is that I was 15 and I chopped it all off. I had it bleached blonde like Madonna and it didn't look right so I bought a box of hair dye and dyed it all black and never looked back.''

Perry also admitted there are certain features on her face she plays up in order to feel more attractive.

She said: " My brows and my eyes, I think, are what frame my whole face. I have all right lips and all right cheekbones, but they're no showoffs. If I get my brows and my eyes right, that really sets the whole face.

Perry added: ''My skin used to be a lot worse than it is so I would use a lot more coverage as I was insecure about my skin.''