We trust young Dermot will have his lips shut tight tonight, when to comes to passing comment regarding Louis' preference for half-clad male backing dancers. Special guest Mariah Carey sings live and then the eight remaining acts have the tough task of following in the American diva's footsteps by each performing one of her songs. As usual, Cheryl Cole, Simon Cowell, Dannii Minogue and Louis Walsh have their say, before the phonelines open for the public to decide which two acts will appear in the final showdown. The results can be seen at 9.35pm, along with a performance from Mariah's ample lungs. Our money is on either Daniel or Rachel going tonight.