Wow, Celine Dion - you can be pretty mean when you want to be.

Alright, perhaps it wasn't fully intentional - but the Canadian singer inadvertently trolled her own fans during her New Year's Eve gig in Las Vegas, when she announced 'So tonight, I would like Adele to be part of our New Year's Eve'.

While it may have been unlikely that Adele would turn up for a tune, it wasn't completely beyond the realm of possibility, right?

Amidst lots of whooping, Dion then instead broke into the Londoner's world-beating 'Hello'.

Watch it below: