Seriously, the team let Shelton hang around a siren.
The stadium was packed with celebrities, including David Spade, who joked that he was "hungover," but he still managed to pose for a pic with the duo.
Like Stefani and Shelton, the 51-year-old actor was also cheering on the Cardinals.
Arizona Native Jordin Sparks was also there. The singer has sung the "National Anthem" inside the stadium before and is no stranger to the NFL, as her dad, Phillippi Sparks, was a former cornerback for the New York Giants and Dallas Cowboys.
Shelton, 39, and Stefani, 46, have been quite the travelers as of late. Before the big game, the Voice coaches were in Oklahoma to celebrate Christmas together in Shelton's home state. Get all the details about their trip in the video below.