Miranda Lambert’s performance of “Tush” with Keith Urban and ZZ Top’s Billy Gibbons at the ACM Awards was a memorable one. One of the most energetic sets of the night, Lambert showed off her rocker side as Urban and Gibbons accompanied on guitar. While the performance itself was flawless, it turns out the song actually came together at the very last minute.

In an interview in the April 18 issue of Country Aircheck, ACM Awards executive producer RAC Clark revealed how the collaboration happened. As it turns out, Lambert had planned to debut a new song and release the single after her performance. Since Lambert’s new music wasn’t ready in time, she had to come up with a Plan B. As Clark explains, Lambert wanted to perform a cover and selected “Tush.”

“‘Tush’ came up and that was perfect,” Clark says. “It’s a rocking 2:30 that Miranda can bring her great energy to. She texted Keith Urban to play guitar and he said he’d like to include another player. I took it upon myself to check Billy Gibbons’ availability and he had one night off on his tour – the night of the show. So he got in about 2AM, they all did an off-site rehearsal that morning, did the dress rehearsal and did the show.”

It was a memorable evening for Lambert, as she was awarded the trophy for Female Vocalist of the Year minutes before she took the stage for her fiery performance.

“I’m excited for women in country music and I’m glad to be here as one of them,” Lambert said during her acceptance speech. “I love y’all, fans. Thank you so much!”

Anderson East and Miranda Lambert Sing Together Onstage