Overview:It is time for the seven remaining acts to find out the result of the public vote. The two acts with the lowest numbers of votes must sing for survival in the final showdown. Then judges Simon Cowell, Cheryl Cole, Dannii Minogue and Louis Walsh will decide who stays in the competition and who is sent home. Plus there is a guest performance by Colombian pop superstar Shakira. Hosted by Dermot O'Leary.