Blake Shelton had quite a night! After wrapping his final episode of NBC's on Tuesday, the longtime coach was feted with an epic after-party and a big surprise. An eyewitness tells ET that Gwen Stefani surprised her husband by making an appearance and giving him a kiss at the show's season 23 wrap party. The «Sweet Escape» singer wasn't able to attend the live taping due to a prior commitment out of town, but arrived just in time to share some of the celebratory night with Shelton. The couple socialized with friends and crew members before Stefani led Shelton to the dance floor around midnight.