Bottoms up! Nude Irina Shayk shows off her perfect derrière for a new book... with a well positioned ink spot protecting her modesty

  She has become one of the most in-demand models in the world, and judging by the latest photograph of Irina Shayk - it's not hard to see why.
The 25-year-old Russian model shows off her perfect figure in a new coffee table book Culo.
Lying naked face down on a rumpled bed, Irina smoulders at the camera while a well-positioned ink spot protects her modesty.

Bottoms up: Irina Shayk shows off her perfect derrière in a new book Culo, executively edited by Sean 'Diddy' Combs and Jimmy Iovine

The book, a collaboration between Sean 'Diddy' Combs, Interscope  chairman Jimmy Iovine and fashion photographer Raphael Mazzucco, features a collection of 248 photographs to celebrate the female backside.
Musician and businessman Combs, who served as executive editor on the project, paid tribute to Mazzucco's work.
'Raphael is a true artist,' he said. 'He relies on instinct - capturing a raw, natural sense of beauty through his lens in CULO by Mazzucco that celebrates the female form. His work is passionate and powerful.'

Sultry: Irina's modesty is covered by a well positioned ink splodge

Happy together: Irina has been dating Real Madrid footballer since last spring

Earlier this year, Irina revealed how she keeps herself in such good shape.
'I really love doing something for myself,' she said.  'When I have a free time, I love going to the spa for a massage.
'I work out four or five times a week with my trainer not because I want to be skinny, but because it just makes me feel good to start my day with a workout.'
Irina, who has been dating Real Madrid footballer since last spring, has been working hard on her modelling career since she landed the prestigious cover of Sports Illustrated earlier this year.
Talking recently about the honour, Irina told Forbes magazine: 'It’s one of the most important things that can happen to a model in her career. People now recognise me on the street.
'A couple of days ago, I took a shower and then was walking my dog, and a man came up to me with a bag full of magazines. He came from New Jersey, and was like, “Can you sign these magazines?” It was about 10 p.m., and here I am with wet hair!'
And, referring to how the cover has changed her life, Irina said: 'The cover has launched countless modeling careers. I did receive requests to be in movies, but I want to concentrate on my modelling.'
Culo will cost $65 and be released in stores on November 22.

Slim figure: Irina, pictured in New York last week,  revealed that she works out for four or five times a week to keep in shape