Kelly Clarkson was pulling double duty during night one of season 21 finale on Monday!Before she takes the stage to perform with her Top 5 finalists, Girl Named Tom and Hailey Mia, on tomorrow's show, the coach treated the audience to one of her new Christmas classics, a holiday-themed breakup track titled, «Christmas Isn't Canceled (Just You).»Dressed for the season in a stunning red gown, on a stage decorated to look like a stunning vintage Christmas scene, Kelly crooned her her new hit, which