Michael Buble kindly invites a 15-year-old fan on the stage with him, to sing as a birthday treat. Watch his reaction when young Sam opens his mouth to perform alongside him.

For the record I'm a lil suspect that this could be a set up but will go with it for now.

The best part of this is Michaels interaction with the kids mom-

What do you this? Is it a set up or is this just happen?

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