Sorry Michael......we're talking Celine here.
Michael Buble was joined by a number of stars for his 'Christmas in Hollywood' special, but none bigger than Canadian megastar Celine Dion!
The two belted out 'Happy Xmas (The War Is Over)' and do we really need to say how amazing Celine sounded?
Of course Michael sounded great too.
Check it out:
You can also see Celine's solo version of 'O Holy Night' below: