Gwen Stefani is having a blast on her unconventional honeymoon! The 51-year-old performer took to Instagram on Wednesday to share pics and videos from husband Blake Shelton's performance at Bash on the Bay, a country music festival in Put-In-Bay, Ohio.In her post, Stefani shared selfies from backstage, as well as a video of Shelton, 45, performing for the crowd.The «Hollaback Girl» singer also shared a photo of the concert's setlist, which included her two duets with Shelton, «Nobody But You»