The married singers accepted the song of the year trophy for their duet, "Over You," at the 46th Annual Country Music Association Awards in Nashville Nov. 1.
"I lost my brother in a car wreck when I was 14-years-old, and later in life when I decided I wanted to be a country singer, my dad always told me, 'Son, you should write a song about your brother,'" Shelton, 36, told the audience as Lambert, 28, stood by his side. "I lost my dad in January, and it's so amazing to me that tonight even after he's gone, he's still right."
Fighting back tears, Lambert then addressed the crowd. "Thank you, Blake, for allowing me to sing this beautiful song and write it with you," the Texas native said. "Thank you CMA and all of our peers for voting for us. It's really emotional. We love y'all."
Shelton also won male vocalist of the year for the third consecutive time, and he was named Entertainer of the Year for the first time. Lambert took home the award for female vocalist of the year.