Tonight's the night I've waited for Because you're not a baby anymore You've turned into the prettiest girl I've ever seen Happy birthday sweet sixteen What happened to that funny face Happy birthday sweet sixteen When you were only six I was your big brother Then when you were ten We didn't like each other When you were thirteen You were my funny valentine But since you've grown up Your future is sewn up From now on you're gonna be mine, so If I should smile with sweet surprise Happy birthday sweet sixteen {key change} If I should smile with sweet surprise It's just that you've grown up before my very eyes You've turned into the prettiest girl I've ever seen Happy birthday sweet sixteen Tra la-la-la-la la-la-la-la Happy birthday sweet sixteen