Cee Lo -- Nicest Celebrity Alive ... Possibly

And now ... here's a video that will put you in a good mood.

It's nothing spectacular ... just Cee Lo being his usual super nice guy self in New York ... chatting with fans, posing for a pic with a little girl ... and even singing a part of his song, "Crazy."

We don't know him personally ... but we've just shot him a bunch of times over the years ... and he ALWAYS seems like the nicest guy in town.