Dee ihe ga-aga n'ihu na paragraf a - "Birthday" bụ nke mbụ e mere na Prismatic World Tour, njem egwu egwu nke atọ nke Perry. Egwú nke abụ ahụ na ụbọchị Newcastle upon Tyne ka a na-agbasa ozi n'oge 2014 Billboard Music Awards
Ọ dị mma.