On the back of this news, here are our guesses...

  • 1
    Harry Connick, Jr.
  • 2
    Michael Bublé
  • 3
    Jamie Cullum
  • 4
    Kurt Elling
  • 5
    Rod Stewart
  • 6
    Robbie Williams
  • 7
    Bryan Ferry

SEE ALSO: Ronan Farrow 'Could Be Mia Farrow's Son'

Also on HuffPost:

Loading Slideshow...