Gaga, real name Stefani Germanotta, teamed up with photographer Terry Richardson, who followed her over a 10-month period, to document her day-to-day life on and off the stage.
The You and I singer told MTV News: 'Terry was with me for a whole year, and, gosh, I didn't hold anything back from Terry. He was with me every minute, every moment.
'It's completely unfiltered. He has photographs of me waking up in the morning, brushing my teeth, in the bathroom, in the bathtub, the shower.'
The 25-year-old added: 'And the thing about Terry, if you know anything about his photography, is that nothing is staged; I mean, that's sort of what he is renowned for.
'He can get you to do things and he can capture things that no one can ever capture.'