Former Saturday Night Live cast-member Martin Short has been tapped to host the always-star-studded SNL holiday show, airing on December 15. This will mark the third time the Canadian-born comic has hosted since he appeared in the show during the 1984-1985 season, when he brought such SCTV characters as Ed Grimley to the show. Short will be joined by musical guest Sir Paul McCartney, which should be completely mental, I must say.