Music Gwen Stefani Makes Surprise Appearance at Blake Shelton's Concert By Jennifer Drysdale 3:59 PM PDT, September 17, 2016 Instagram Blake Shelton fans were treated to one heck of a surprise on Friday night!It was business as usual for the 40-year-old country star during his St. Paul, Minnesota, concert -- until Gwen Stefani made a surprise appearance! WATCH: Gwen Stefani and Blake Shelton Are the Cutest Couple Ever in Surprise Dallas Performance"Hi Minnesota Gx," Stefani captioned a shot of herself in Shelton's tour bus before heading onstage. View this post on InstagramHi Minnesota GxA post shared by Gwen Stefani (@gwenstefani) on Sep 16, 2016 at 6:56pm PDTThe duo couldn't have looked more stylish while jamming to their duet, "Go Ahead and Break My Heart." WATCH: Gwen Stefani Talks Likelihood of No Doubt Reunion, Whether She'll Marry Again: 'You Never Know'See Stefani's surprise below.And of course the "Misery" singer couldn't leave before performing one of her own hits -- and getting a huge bow-down from her beau. WATCH: Gwen Stefani Fan Girls Over Blake Shelton's Performance At Ashton Kutcher Charity Event, Discovers Jello ShotsThis isn’t the first time the couple has made a surprise appearance at each other's shows.In fact, Shelton surprised Stefani's fans during her Detroit, Michigan concert just last month -- and the two couldn't help but cuddle up on stage.See more in the video below.Gwen Stefani Cozies Up to Boyfriend Blake Shelton During Surprise Tour Appearance: See the Pics!