Katy Perry refuses to take pictures or sign autographs with fans when she's on holiday. She confessed she wants to relax and enjoy personal time to herself. 'I'm always spending a lot of time with my fans, I'm very happy to pose and very happy to take pictures,' she told Entertainment Tonight.

'But when I'm off I take that very seriously. I just say I'm on vacation, I'm very sorry. I love you. Because everyone is essentially paparazzi, nobody is not paparazzi.'

Katy said she mooned the paparazzi in the early days of her career.

The singer says she loves to play silly pranks on people from time to time. 'I'm still her, nothing has quite changed. I do like to have a practical joke here and there,' she said.