On Monday, NBC aired America’s Got Talent: Holiday Spectacular and brought back Season 11 winner Grace Vanderwaal. The 12-year-old ukulele-playing singer returned to the stage that made her famous. Before performing, she recounted how nervous she was to audition for the show.

However, Monday’s performance was a victory lap. Vanderwaal performed “Frosty the Snowman” with her unique voice, along with a chorus of kid singers.

The audience and judges were enamored with the young singer’s performance. Howie Mandel joked, “When I hear you, my heart is bursting. But most of all, with your success and the fact that you won and you’re my Golden Buzzer, you make me realize each and every day how good a judge I really am.”

Watch how Grave Vanderwaal won America’s Got Talent:

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