Musicians Jennifer Nettles, Miranda Lambert, Reba McEntire, Martina McBride, Carrie Underwood, Naomi Judd, and Wynonna Judd perform onstage during ACM Presents: Girls' Night Out: Superstar Women of Country concert held at the MGM Grand Garden Arena on April 4, 2011 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images)