Martina McBride (C) and (L-R) Jimi Westbrook, Kimberly Schlapman, Karen Fairchild, and Phillip Sweet of Little Big Town 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