Taylor Swift will serve as a judge for a contest that encourages teens to rewrite traditional holiday carols into songs about safe driving over the holidays. Titled Holiday Holla, the contest is sponsored by the Allstate Foundation. Swift will help select the final winners at the Mall of America in Minneapolis on Dec. 8. She will also perform at the event. "This contest is a fun and creative way to make teens and their parents aware of how dangerous the holiday season is for teen drivers," said Swift.