<prompt> Bhala ukuqhubeka kwalesi sigaba - Birthday yadlalwa njengesiqephu sokuqala ku-Prismatic World Tour, uhambo lwesithathu lukaPerry. Ukusebenza kwengoma ngosuku lwaseNewcastle upon Tyne kwasakazwa bukhoma ngesikhathi se-2014 Billboard Music Awards  <response>: . futhi. 