Ràng wǒmen wèi jīntiān de shòuxīng chàng shǒu gē ba!
Let's sing a song for today's birthday star!
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寿星 originally refers to the Star of Longevity (Canopus) and the Taoist deity 南极仙翁 (Nánjí Xiānwēng), depicted as an old man with an enormous forehead. In modern usage, it simply means 'the birthday person.'