Emma Willis hosts the live semi-final, which begins by revealing which act has won the lifeline vote. The remaining performers selected by coaches Jennifer Hudson, Will.i.am, Tom Jones and Olly Murs must now give it their all if they are to win one of the four remaining places in next week's final, where they ill compete for the chance to win a recording contract. The decision over who will be going through to the last round and who will be leaving the show tonight lies entirely with the votes of the viewing public.