So unless you've been living under a rock, you'll know that Tulisa got well and truly into the Halloween spirit, hitting the X Factor stage in a Catwoman costume, and temp judge Alex opted for glam black and silver sparkles.
And also, who was the best dressed judge?
Check out all the style moments from Tulisa and Kelly (and Alex) throughout the live shows here:
Steal Tulisa's style by browsing our pick of the best black all-in-ones (cat ears optional):
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