It's a hap hap happy birthday

It’s a hap, hap, happy birthday,
May you live to be,
A hundred and three,

It’s a hap hap happy birthday,
A hap happy birthday to you.

Take a vow (2) on your birthday, your birthday, your birthday
Show them how (2) on your birthday, your birthday, your birthday
U can still look as good as new,
It’s a hap hap happy birthday,
A hap happy birthday to you.