By Katie Wilson Princess Kate is radiant in a glittering outfit worn for the first look at her special Christmas carol service, which will air ITV. The Princess of Wales beamed in a chic off-white glittering blazer as she stood in front of a Christmas tree in a promotional clip ahead of the service at Westminster Abbey, which will be filmed on Friday, December 8 but shown on Christmas Eve at 7.45pm. A teaser clip for Royal Carols: Together At Christmas programme featuring Kate was released on ITV1 at 9.45pm on Thursday. In it, Kate says: “Join me this Christmas Eve for a special carol service,…