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We already know Jessie J's voice is impressive ... but she took her talents a step further when she sang a little bit of her hit featuring Ariana Grande and Nicki Minaj "Bang Bang" with her mouth CLOSED.

Jessie appeared on the U.K.'s "The Graham Norton Show" recently where she showcased her hidden talent, which she discovered when she was a little girl. She said on the show:

"When I was younger, I actually did an audition -- I used to do auditions all the time -- and I was asked what I could do. And I discovered when I was little that I could pretend I was in a box."

After demonstrating her talking-in-a-box abilities, she impressively sang a little big of "Bang Bang."

So, how does one sing with their mouth closed, you ask? Just watch below! 

Watch Jessie J sing "Bang Bang" with her mouth closed: