Thanks, I was surprised that IMDb has got it down as "Gotta," because the way they pronounced and what it meant (as I can dance, I supposed) didn't make sense to me to be "gotta." So I wanted to make sure.

And here was "Got a dance" as well:

http://www.geocities.com/classicfilmfreak/Singin-in-the-rain.html

Anyway, thank you.