Rihanna -The more I got naked the more comfortable I felt

'The more I got naked the more comfortable I felt. I just had to face my fear,' she revealed to Women's Fitness magazine. Since overcoming her inner demons the songstress has sold more than 25 million albums and 60 million singles worldwide making her one of the best selling artists of all time.

And this spring she is set to take on her first acting role in the action thriller Battleship alongside Taylor Kitsch and Liam Neeson.

She added: 'You always find something wrong, you always find something you’re uncomfortable with, and one thing turns into another and you get embarrassed and self-conscious about it.

‘After a while, it was like, “What’s the worst that can happen?” and I just started being a little more daring with it.

'It was just knowing my body is the way it is no matter what that helped me, knowing that it is what it is under clothes or outside of clothes.’

‘I had to do a lot of physical training with a personal trainer as well as a soldier, and it was gruesome, but fun,’ she said. ‘One man drilled me, yelled at me, made me do push-ups. It really got you in the mentality.

Her personal trainer Harley Pasternak - who has also worked with the likes of Lady Gaga, Kanye West, Robert Pattinson, Megan Fox, and Katy Perry - says Rihanna keeps in shape with short, sharp routines involving cardio, resistance work and core exercises.

‘If you want to work out like Rihanna, train hard and often, but not long. Rihanna is really driven, there’s no need for me to motivate her.

'She trains for at least 25 minutes at a time, and she loves skater lunges, deadlifts and dumbbell work... Her least favourite exercise is running.’

Rihanna admits to indulging in a few of her guilty food pleasures, every so often.
‘My favourite food right now is microwave butter popcorn,’ she confesses. ‘And when I’m in London I’m close to authentic Jamaican food, so I tend to eat that every day.'