Academy of Country Music Awards 2014

Kacey Musgraves's ACM Awards Photo Diary

Country's hottest newcomer takes PEOPLE backstage and behind-the-scenes at the Sin City ceremony

GRAND ENTRANCE

Welcome to the big leagues! Newcomer Kacey Musgraves arrives for rehearsals at Las Vegas's MGM Grand before Sunday's ACM Awards, where she was nominated for best female vocalist alongside Carrie Underwood, Martina McBride, Miranda Lambert and Taylor Swift.