Katy Perry booed after offering to perform Bieber song

She was performing at London’s Hammersmith Apollo on Friday, when she asked the crowd if they would like to hear her sing a track by the 17-year-old.

According to the Mirror, the audience made it quite clear that this was the last thing they wanted, prompting her to plead: “Justin is mine and Russell’s adopted son. We love him dearly. Don’t boo him, guys. Come on.”

Meanwhile, her hubby Russell Brand has admitted he has trouble watching his language around children.

The couple married last year, and both have been vocal about wanting to start a family.

But Brand admitted he needs to work on zipping his lip around other peoples’ kids before he becomes a daddy himself.

He told The Sun: 'When I'm around my mates' children, I jazz them kids up. I swear at them, I get them all worked up. I fill their heads with crazy nonsense, then leave them. I love children - when I'm among children is when I feel most liberated. I don't feel like, 'Oh there are some children here, I have to tone it down'. I go nuts.'