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Controversial act Clark, who was recently evicted from his hotel following his drunken antics with fellow act Lucy Spraggan, dressed up as an American footballer, dyed his hair grey and added fake blood to his exposed midriff.
Tulisa arrived in a corseted dress, fangs and fake blood dribbling down her neck, while fellow judge Scherzinger donned a rubber corset under a black coat, fishnet tights and black rubber gloves.
Other X Factor guests at the bash included Kye Sones, former finalists MK1 and Melanie Masson, Union J, District3 dressed as red devils, Jahmene Douglas and Lucy Spraggan dressed as a pumpkin.
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