The 31-year-old country music star had a successful night at the awards bash last month and, speaking on "The Late Late Show with James Corden", she recalled how she celebrated the wins.
Revealing she shared a pizza with Willie Nelson on his bus, the "Space Cowboy" hitmaker confessed she doesn't really know how the night went after that.
"We leave, we hit some Nashville honky-tonks, it's really fun. The next thing I know, I'm in this barn and Reese Witherspoon is playing the bongos, Gigi Hadid is also playing the bongos, I'm singing with Ronnie Dunn," Kacey said.
However, the rest of the night is a blur for the singer, who coyly added, "And then, yeah, I woke up…I don't know what happened!"