Andrea Bocelli Crashes Holiday Party With That Voice!

Andrea Bocelli is still giving free performances in between his huge arena shows.

Bocelli surprised 150 employees at Skybridge Capital, a hedge fund in NYC, when he popped up at their holiday party and belted out "Ave Maria." No big deal.

The singer's in town for a Wednesday night gig at Madison Square Garden, but the Skybridge crew got a MUCH more intimate show inside the Hunt & Fish Club ... a fancy steak house in Midtown.

Bocelli only did the one song, but if ever there was a case for dropping the mic ... this is it.

We're told he hung out for an hour to take pics and chat. Molto bene!