Blake Shelton, 45, and Gwen Stefani, 51, are a serious power couple! The “Hollaback Girl” singer supported her husband when he hit the stage for an August 25 concert at Bash on the Bay in Put-in-Bay, Ohio. The blonde beauty shared a series of selfies backstage, including a clip of Blake hitting the stage, and a sneak peek at his set list. It featuted a number of his biggest hits, along with the couple’s duets “Nobody But You” and “Happy Anywhere.”