Dierks Bentley has a special wedding gift for his friend, Blake Shelton, and it's helping him win !The country star is currently on his Beers on Me Tour, and recently spoke with ET's Cassie DiLaura at a concert stop at the Shoreline Amphitheater in Mountain View, California, where he opened up about joining the hit NBC reality competition series as a mentor for Shelton's team.«It was amazing, you know? It was so great seeing him,» Bentley recalled of reconnecting with Shelton. «We hadn't seen