The country music star took to the stage at the MGM Grand Garden Arena in Las Vegas in a black sequinned jumpsuit to perform a rendition of her track Little Red Wagon, which traditionally features the line "I live in Oklahoma", where she used to reside with Blake while they were married between 2011 and 2015.
They're calling it country music's "biggest party of the year", and I'll just have to take their word for it. You have no idea what you mean to me. "Tequila" also won song of the year for songwriters Dan Smyers (a Wexford native), Jordan Reynolds and Nicolle Galyon (Shay Mooney didn't write the song).
Male artist of the year went to Thomas Rhett.
Musgraves also won album of the year for her latest record, "Golden Hour".
The pop singer joined the country music superstar for a very special date night at the 2019 Academy of Country Music Awards on April 7 and documented some of their sweet and celebratory moments from the outing on Instagram and her Instagram Stories.
This year's show will air on CBS. Plus, Jason Aldean will be honored with the prestigious ACM Dick Clark Artist of the Decade Award.
"More than anything - thank you to the country music fans (and) country radio, you guys have changed my life forever", he said.
While this wasn't the first time Lambert, 35, has sung the updated rendition of the hit song, she has never done so with Shelton present - seemingly shading the "Voice" judge in front of his longtime girlfriend Gwen Stefani in the process.