YOU SAID:
Justin bieber has a birthday on his birthday
INTO JAPANESE
ジャスティン・ビーバーは彼の誕生日に誕生日を迎えます
BACK INTO ENGLISH
Justin Bieber celebrates his birthday on his birthday
INTO JAPANESE
ジャスティン・ビーバーは彼の誕生日に彼の誕生日を祝います
BACK INTO ENGLISH
Justin Bieber celebrates his birthday on his birthday
That didn't even make that much sense in English.