The Voice co-stars enjoyed a selection of the winery's Italian offerings, including a Pinot Grigio. The source shared that the couple were "delightful" to the staff and "seemed very happy together."
The Winery later shared a photo of Stefani standing with manager Louise Smith, along with a message of gratitude for the couple's visit.
"Mosby Winery had the distinct privilege of hosting Gwen Stefani & Blake Shelton along with 2 of their friends today! What an absolute treat!" the Winery's Facebook post read. "They were so wonderful, sweet & just great people... Thank you so much for visiting & I hope to see you again!"
One fellow wine-taster also snapped a pic of the 39-year-old country crooner at the winery, which they shared to Instagram.
The most recent pic Stefani shared was of her and Shelton's trip to University of Phoenix Stadium in Glendale, Arizona, to watch the Arizona Cardinals play the Green Bay Packers on Sunday. The two lovebirds took a moment to snap a cute selfie while sitting on the sidelines.