Grace VanderWaal got into the Christmas spirit on Monday (December 19), when the young America's Got Talent champion returned to the stage to perform a charming cover of "Frosty the Snowman."

The Season 11 winner, who went viral performing her original song "I Don't Know My Name" back in June and later signed to Columbia Records, put her best tartan skirt forward while treating the crowd, and a visibly delighted Simon Cowell, to her children's choir-backed, low-key, yet upbeat rendition of the holiday classic.

Watch below:

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