Who says Christmas is commercialized? Tonight’s one-hour special, which follows an episode of The Voice featuring judge Blake Shelton, is a holiday showcase for Gwen Stefani, who has appeared as a judge on The Voice in the past – and appeared last week to sing this special’s title song, with Shelton, as a special Voice guest star. Tonight, Shelton shows up to sing the song again, as a guest on Stefani’s NBC special – which also has the same name, and the same featured song, as her new, holiday-themed Christmas album.