Brett Eldredge and Kelly Clarkson recently made musical magic with the release of their holiday duet "Under the Mistletoe." But although the two artists sound perfectly in sync in the studio recording of the song, they'd actually never met in person before signing on to sing it together -- a first for both duet partners. While they may not have met "Under the Mistletoe," Eldredge and Clarkson recently finally did meet in person during an episode of Clarkson's The Kelly Clarkson Show. There, they traded notes on how strange it was to cut a song together despite never having gotten the ch...