The couple watched the Arizona Cardinals defeat the Green Bay Packers yesterday at the University of Phoenix Stadium. Shelton wore a Cardinals sweatshirt and Stefani donned a camouflage Cardinals baseball cap.
The Voice coaches were "sitting close and holding hands at one point," a source told E! News. "They were extremely friendly to fans, players and the people around them. Blake loves football and is a big fan of the Cardinals so it was nice that Gwen saw him in his sport element."
The Cardinals' official Twitter posted a picture of the couple posing for a selfie.
The game served as a great way for Shelton and Stefani to wrap up the holiday weekend. They spent time in his home state of Oklahoma before Christmas, and flew to Arizona from Los Angeles, where she lives with her three sons.