"I tried on pretty much everything that exists in Nashville," the singer joked to PEOPLE of her lengthy fittings
Credit: Jeff Kravitz/FilmMagic

For the artists performing during Wednesday’s CMA Awards, “Country Music’s Biggest Night” means several jam-packed days of rehearsals, interviews and fittings. Especially for the show’s most nominated artist, Miranda Lambert, tagged in a staggering nine categories.

“I had a four-and-a-half-hour fitting Monday,” the singer told PEOPLE in Nashville this week. “I tried on pretty much everything that exists in Nashville. I have five changes to make. I’ll be sprinting in my heels backstage.”

The five outfits cover arrival, audience-sitting, post-show press and parties, plus two performances. “We’re performing ‘Smokin’ and Drinkin” from my album with Little Big Town,” she shared. “They are my favorite band. I am a huge, huge fan of theirs. They’re so awesome and hot and nice. They’re pretty much perfect!”

Lambert is also teaming up with Meghan Trainor for a country mash-up of the pop starlet’s hit “All About That Bass.” “That has been our tour song,” Lambert said. “We cranked it up before we went on stage all summer. Her people called my people and asked me to do it. I was like, ‘Hell yeah!’ It was a no-brainer. I think we’re a great partnership, I feel like we’re kindred spirits. The message of that song is what I’m all about.”

Lambert is the only woman in a field of four men for the coveted Entertainer of the Year award, competing against husband Blake Shelton, who took it home in 2012.

“Being the only woman is a responsibility itself because I really feel like I represent the women in country and should champion all the other female artists,” she said. “There are so many women who did this before me that inspired me and were so good to me, that I have learned so much from.

“Blake and I are just happy for each other, we’re so proud of each other,” she continued. “But it’s not just us. The competition in the Entertainer category is really tough. Either way, if one of us wins, it goes home with us to Oklahoma and we can share!”

Lambert is already one-for-nine, finding out on Good Morning America that she and Keith Urban won musical event of the year for their duet “We Were Us.”

The 48th Annual CMA Awards air live on ABC tonight, Wednesday, Nov. 5, at 8 p.m. ET.

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