When I dance it says

"Note: The ballroom uses the Enamored expression, so make sure you have that set!"

But I'm wearing the 'Happy' expression and it lets me dance just fine...

You can be wearing any expression, but in the ballroom it always shows enamored.

I think it defaults to whatever smile you have set up as your "enamored" expression. I dunno, I've never had an issue with it.

enamored is set by default already. it just means that since enamored is the expression used when on the masquerade dance floor, be sure you have it set to something you like so you don't look silly if you care about it.

Yup, that's what happened to me :P The only reason I noticed is because I'm wearing a half-mask.

Hm. I still have the Enamored expression to be set as the "heart eyes" from my newbie days, because I just use the "Happy" expression for everything and change the mouth when I want to. I guess my mask & makeup cover up the heart eyes :b