Grocery store employee stuns shoppers with performance of 'O Holy Night'

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Some shoppers at a Massachusetts grocery store got chills, and not from the air conditioning in the frozen foods section.

They were stunned, hearing the amazing singing voice of one of the store’s employees.

Guilherme Assunção works as a deliveryman at Russo's Produce in Watertown, near Boston.

He originally hails from Brazil and is an aspiring singer.

Now he's an online sensation after footage of his incredible singing voice went viral over the weekend.

He treated customers to a beautiful, impromptu rendition of “O Holy Night" last Friday.

He noticed owners of the shop setting up sound equipment for a group of singers they had hired and couldn't help belting out a tune.

Now locals can't stop singing his praises.