A new book will document pop star Lady Gaga's life behind the scenes of her 'Monster Ball' tour.

The 'Alejandro' hitmaker has teamed up with photographer Terry Richardson to document her offstage life during the world tour, reports femalefirst.co.uk.

Though she enjoyed the attention, she admits she felt uncomfortable with the idea of someone following her all the time.

'He wanted to do a book about the 'Monster Ball'. He wanted to shoot me backstage, not onstage, and look at who I am offstage. He is on the bus with me. He just follows me everywhere,' said Gaga.

'He'll photograph me when I'm changing - those quick changes during the show. And sometimes I'll have to pee during the show, and I'm always screaming, 'Terry, get out!' And he'll be saying, 'It's so beautiful. You're so punk!' If only my fans knew I was peeing in a beer cup backstage,' she added.