So while we usually pitch Kelly and Tulisa against each other in the style stakes every Monday, today's Kelly Vs Tulisa becomes Alex Vs Tulisa. (See what we did there? It's a very simple format.)
So while Kelly was recovering over in LA on Saturday night, 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.
Tulisa vs Alex: Saturday night's Halloween style. Photos:Rex Features
Tulisa vs Alex: Sunday night's Halloween style. Photos:Rex Features
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And also, who was the best dressed judge?
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Check out all the style moments from Tulisa and Kelly (and Alex) throughout the live shows here:
- Week ten: Sunday night<p> Tulisa tottered out on stage for the grand finale in a purple-blue mermaid dress by Fashion Fringe winners, Fyodor Golan.</p>
- Week ten: Saturday night<p> For part one of the <em>X Factor</em> final, Kelly Rowland slipped on this floor-length frock by Nicholas Oakwell.</p>
- Week ten: Saturday night<p> Tulisa went for high-volume to hit Wembley Arena, in a dotty tutu-prom dress.</p>
- Week ten: Saturday night<p> Kelly Rowland changed out of her glam gown and into this glittering gold mini to perform a duet with Amelia Lily.</p>
- Week ten: Saturday night<p> Tulisa swapped into this structured LBD to perform on-stage with eventual winners, Little Mix.</p>
- Week nine: Sunday night<p> Kelly brought some Christmas sparkle to the <em>X Factor</em> on Sunday night's show.</p>
- Week nine: Sunday night<p> It was another mini dress for Tulisa on Sunday...</p>
- Week nine: Saturday night<p> Kelly did her own take on sexy secretary in this black and white number with double thigh-splits.</p>
- Week nine: Saturday night<p> We love this look! We would like to see Tulisa wear more floor-length styles.</p>
- Week eight: Sunday night<p> Kelly opted for a feminine, floaty number teamed with suede platforms and a fishtail plait.</p>
- Week eight: Sunday night<p> Tulisa's strangest outfit choice yet? There's too much going on with this dress for our liking.</p>
- Week seven: Sunday night<p> Kelly struck a pose in a metallic structured Philip Armstrong dress with sheer panelling.</p>
- Week seven: Sunday night<p> There was some vague colour co-ordination from our female judges on the Sunday night, with Tulisa opting for a turquoise lace-sleeved Matthew Williamson shift and bright blue heels.</p>
- Week seven: Saturday night<p> Kelly opted for a beaded Sass & Bide maxi for week seven's Saturday show, teamed with super-sparkly Louboutin platforms.</p>
- Week seven: Saturday night<p> Tulisa worked her own version of the staple LBD with added texture and a metallic waist-cinching belt.</p>
- Week six: Sunday night<p> Tulisa rocked a floral mini and a pair of red platforms for the week six results show.</p>
- Week six: Sunday night<p> Kelly did gothic glamour on Sunday.</p>
- Week six: Saturday night<p> Is this Dannii-esque? Tulisa looked gorgeous in this tulle Bruce Oldfield gown.</p>
- Week six: Satuday night<p> Kelly did androgynous in a super sharp suit on Saturday.</p>
- Week five: Sunday night<p> Tulisa went for a frilled mini for the results show but it was her ribbon belt which caught our eye.</p>
- Week five: Sunday night<p> Kelly repeated the full-length glam of the Saturday show in this white floorsweeper with silver sparkles.</p>
- Week five: Saturday night<p> Tulisa keeps it youthful with this asymmetric minidress.</p>
- Week five: Saturday night<p> Kelly was fighting fit in a dramatic scarlet dress after returning from her sick bed .</p>
- Week four: Sunday night<p> Tulisa stuck to the spooky style theme for the Halloween results show, in a smoky patterned maxi.</p>
- Week four: Sunday night<p> Kelly's stand-in, Alexandra Burke, was back for Sunday night's show too, and flew the flag for British design talent in a striking Jonathan Saunders shift dress.</p>
- Week four: Saturday night<p> Happy Halloween! Tulisa got well and truly into the spirit of the evening in her leather catsuit, (complete with Catwoman ears.) Good on her!</p>
- Week four: Saturday night<p> With Kelly Rowland feeling under the weather, former<em> X Factor </em>winner Alexandra Burke stepped in to fill her judges' seat - and did so in style in this black and metallic shimmering mini.</p>
- Week three: Sunday night<p> Tulisa upped her style game in shimmering green Dolce & Gabbana.</p>
- Week three: Sunday Night<p> Kelly got heads turning in her sheer-skirt Falguni & Shane Peacock frock.</p>
- Week three: Saturday night<p> Kelly rocked out for <em>X Factor</em>'s rock-themed week, in a plunging leather mini dress - from Topshop!</p>
- Week three: Saturday night<p> Tulisa opted for goth-glam in a floor-length halterneck Herve Leger gown, covered in silvery chains.</p>
- Week two: Sunday night<p> Kelly flashed the flesh in a revealing Julien MacDonald creation.</p>
- Week two: Sunday night<p> Tulisa pirouetted onto the Sunday night stage in a flared white tutu dress, courtesy of bridal wear designer Bruce Oldfield.</p>
- Week two: Saturday night<p> Kelly Rowland was the resident lady in red on Saturday night, in a chic scarlet number.</p>
- Week two: Saturday night<p> Tulisa went all out for week two, in a dramatic laser cut creation.</p>
- Week one: Sunday night<p> Kelly got feathered for Sunday night's show, in an embellished Roberto Cavalli gown.</p>
- Week one: Sunday night<p> Kelly flaunted her pins in a sparkling sequin mini dress.</p>
- Week one: Saturday night<p> Kelly made one hell of an impact for the first of <em>X Factor</em>'s live shows, in a striking Irish-dancing-esque Versace dress.</p>
- Week one: Saturday night<p> Tulisa flashed her midriff in a nude Herve Leger number.</p>
- Week ten: Sunday night<p> For her last ever X Factor fashion moment, Kelly turned to Julien Macdonald, who created this metallic gold bespoke number.</p>
Steal Tulisa's style by browsing our pick of the best black all-in-ones (cat ears optional):
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