Katy Perry was overwhelmed with boos from her recent London crowd (March 17) after mentioning the name Justin Bieber. 

The 'Teenage Dream' singer told her audience that she was going to play a game with them called 'Jukebox' and asked for £1.

When asked what songs they wanted to hear, someone yelled out Justin Bieber and when Perry repeated his name over the speaker system she was bombarded with angry rants.

Defending the 17-year-old 'Baby' star, she said:

"You know that Justin Bieber is my adopted son with Russell? He is!"

She settled with Rihanna's 'Only Girl (In The World)' much to her fans' excitement and you can watch the full video, including the performance, here: