It's no secret that singer/songwriter Jessie J is incredibly gifted, but you won't believe what her hidden talent is.

Recently, the pop star appeared on The Graham Norton Show on BBC, and revealed that she can speak and sing with her mouth closed. The singer claimed that she's been practicing this art since she was a child - and she even demonstrated her talent for Graham Norton and the rest of crew.

You can see the interesting act for yourself by watching the video above, and skipping to 1:18.