The 44-year-old star, who seemed visibly surprised -- thanked Stefani, 50, while accepting his hardware for single of the year for “God’s Country" for "encouraging me" and "for being my inspiration."
“Thank you God!" the country star added from Los Angeles.
Shelton and Stefani also performed at this year’s awards ceremony with a duet of their single “Happy Anywhere” which they played on a green-screened Bluebird Cafe.
Shelton’s win marked his sixth ACM win in 24 nominations.