The night took in everything from Tinie Tempah and Crystal Waters mash-ups by MK1 to Rylan doing his best JLo impression - as well as James Arthur's bluesy cover of 'Sexy and I Know It' by LMFAO, or LMFO, as they have been rechristened by Louis Walsh...
Relive the contestants' performances through our gallery below:
Copyright: Ken McKay/Thames/Rex Features





















