《aaa 生日快樂歌》的歌詞是：
Happy birthday to you, 祝你生日快樂，
Happy birthday to you, 祝你生日快樂。
Day and night I keep keep keep thinking about you,
晝夜思念，我無法自已，
Waiting for your birthday, 等待你的生日，
Till it comes around, 盼望著那一天的到來，
I'll give you something that you'll remember,
我會給你特別的禮物讓你銘記在心，
All through your life, 讓你一生難忘，
Just because I love you, 因為我是如此地愛你。
Happy birthday to you, 祝你生日快樂，
Happy birthday to you, 祝你生日快樂。
Now let the party begin, 慶祝開始吧，
And all the stars will shine, 星星也將閃耀，
For you and all your friends, 為了你和你所有的朋友，
Here on earth, 在這人世間，
Ain't it nice when someone special,
有特別的人為你慶祝，
Remembers all your life, 這感覺多美好，
It's for you today, 因為今天屬於你。
副歌：
So grab all your friends and have a good time,
所以帶著你的朋友們一起享受這美好時光吧，
Sing this song for one and all, 為每一個人唱起這首歌，
And if you don't know what to sing, 那么如果你不知道唱什麼歌，
Just remember this is special, 就記住今天是個特殊的日子。
合唱：Happy birthday to you! 祝你生日快樂！