Blake Shelton's final season of, and he's leaving some big boots to fill!The NBC singing competition kicked off season 23 on Monday with a new batch of Blind Auditions that left Blake as impressed by the level of talent as he was by new coach Niall Horan.The pair seem to have hit it off right away, with plenty of father-son jokes and Niall's spot-on impression of Blake's Oklahoma accent. «Blake is really on Team Niall,» the Irish singer joked after Blake endorsed him to a hopeful contestant. «Or, he just really hates Kelly Clarkson.