And THAT ladies and gents, is how it's done!
Mariah Carey can sing ANYTHING — even on a moment's notice!
The American Idol judge stopped by Belmans Bar, where she delighted unexpecting bar-goers with a little tastey-taste of her AH-Mazing Jazz skills!
Ch-ch-check out Mariah's impromptu performance (above)!
Taking a page out of hubby Nick Cannon's book, MiMi even improvised some lyrics!
Obvi, she is incrediballz! Wish would have been there to see it LIVE!