WATCH: Why Don't We Sing A Cappella Chubby Bunny Christmas Song

Why Don't We | Getty Images

Backstage at the Kiss 108 Jingle Ball, Billy Costa challenged the boys of Why Don't We to an impromptu game of Christmas chubby bunny.

Seconds after stuffing their mouths with marshmallows, the boys broke out into an a cappella rendition of their Christmas song, "You And Me At Christmas."

Check out the hilarious video below:

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