Of the 24 semifinalists chosen last week, the Top 12 girls will perform for America for the first time. Then it’s up to the viewers to vote for their favorites. Who will survive and who will go home? Performing tonight: Alaina Alexander, Amy Krebs, Antonella Barba, Gina Glocksen, Haley Scarnato, Jordin Sparks, Lakisha Jones, Leslie Hunt, Melinda Doolittle, Nicole Tranquillo, Sabrina Sloan, and Stephanie Edwards.