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Who: Tulisa Contostavlos and Nicole Scherzinger.

What: The battle for the most stylish X Factor judge continued last night as Tulisa and Nicole stepped on to the stage in completely different dresses.
While Tulisa went for girlie in a lilac sequin number by Jovani, Nicole opted for a sexy lady look in a strapless leather Ermanno Scervino frock with a pleated waist, teamed with Guiseppe Zanotti heels.
Where: London.
Verdict? Both pretty, but Nicole's gorgeous get-up just pips Tulisa's sheer chic to the post.
Now for more Tulisa looks:
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The Perfect 10: Tulisa Contostavlos
<strong>June 2012</strong>
Tulisa wore tartan, a cropped Biker jacket and peplum skirt for Scottish X Factor auditions
The Perfect 10: Tulisa Contostavlos
The Perfect 10: Tulisa Contostavlos
The Perfect 10: Tulisa Contostavlos
<strong>May 2012</strong>
At FHM's Sexiest Woman in the World 2012 awards, Tulisa Contostavlos wore a one-shoulder studded LBD
The Perfect 10: Tulisa Contostavlos
The Perfect 10: Tulisa Contostavlos
<strong>January 2012</strong>
Tulisa sportted a hot pink feather number to the NTA's.
The Perfect 10: Tulisa Contostavlos
<strong>November 2011</strong>
Tulisa played the evening's scarlet woman at the Cosmo Awards, in a one-shoulder Suzanne Neville mini dress
The Perfect 10: Tulisa Contostavlos
<strong>October 2011</strong>
Tulisa Contostavlos joined the rest of the UK glitterati on the Pride of Britain red carpet in an attention-grabbing Vivienne Westwood print dress.
The Perfect 10: Tulisa Contostavlos
The Perfect 10: Tulisa Contostavlos
on!