The 46-year-old singer looked simply stunning in a long, flowing white gown, which evoked the striking elegance of a wedding dress. Backed by several willowy, white trees and engulfed in soft, white fog, Stefani's touching performance was heavenly.
As Stefani's song came to a close, the entire audience exploded in a chorus of cheers, but no one seemed more excited than Shelton, who was absolutely beaming as he gave his new girlfriend a round of proud applause.
Shelton spoke with ET before Monday's live episode, saying he was "thankful for Gwen for tons of reasons." The country crooner even teased the striking white gown Stefani wore, calling it "stunning" and "beautiful."