Singing... along? Egad, no, that almost never happens as it really annoys the crap out of me when people sing along with music I enjoy listening to, as I'm not trying to hear them. Consequently it feels hypocritical to sing over other music even when I'm by myself, so I generally don't.
If the question is just "Do you sing?" then the answer would be yes, quite a bit, and quite well - I spent 7 years in a showchoir, so I spent a lot of time singing and dancing on stage in front of an audience, at times all by my lonesome; nobody ever complained.
I just won't sing over top of pre-existing vocals.