Katy Perry has proved herself to be a true Justin Bieber fan, dressing up in the Bieb’s trademark purple hoody with a group of her mates.
Katy went to see Justin at his concert at the Staples Centre in LA and she shared this picture on her Twitter,
“Last night I saw The Black Keys, tonight I saw Bieber. I think my musical week is complete,” Katy wrote, before adding, “WE ARE BELIEBERS!”