Watch the USA Network's Nashville Star tomorrow night at 10 p.m. Eastern to catch special guest LeAnn Rimes, who'll perform on the grand finale. Talent shows are nothing new to LeAnn, who, as a child, won many rounds on the show Star Search. In addition to LeAnn's performance, the three remaining finalists will also sing, as well as the eight contestants who were eliminated earlier this season. The new "Nashville Star," who will win a recording contract with Sony Music Nashville, will then perform his debut single, which will ship to country radio on Monday, May 3.