For the couple's 25th anniversary, McGraw posted a video on Instagram in 2021 explaining how he proposed to Hill.
McGraw recalled he and Hill were in a trailer while he was waiting to go onstage at an outdoor music festival when he said they should get married.
"She said, 'You're asking me to marry you at a country music festival in a trailer house?'" McGraw recalled. "And I said, 'Well, it's pretty apropos if you think about it.'"
McGraw said he then went on stage to perform his part of the set and when he returned to the trailer, Hill had written, "Yes, I'm gonna be your wife" in lipstick on a mirror. He said they still have that mirror.