Jessie J can do something with her mouth closed that I can't even get near to doing well with my mouth open:  Sing.

The 'Price Tag' singer has already shown she has a crazy strong voice -- but this time, she's showing she can even sing her songs without opening her mouth.

The British star shared her hidden talent on 'The Graham Norton Show,' revealing that she can talk -- and sing! -- with her mouth completely closed.  I'm lucky if I hit a correct note while singing in the shower.