By Daily Mail Reporter
Classic: Nicole Scherzinger arrives for the X Factor auditions in Dallas in a demure lace blouse teamed with a flouncy black skirt
They've been battling to outshine each other in the X Factor fashion battle in sexy, colourful frocks.
But in a change of pace, both female judges on the American series opted for demure, monochrome outfits at the Dallas auditions yesterday.
Nicole Scherzinger and Paula Abdul both shunned the cleavage and eye-catching colours for high-necked outfits, and both wore their hair in sleek, gravity-defying hairstyles.
Nicole,32, wore a white lace blouse with sheer bat-wing sleeves and a high neckline.
She added a flouncy, thigh-skimming black skirt to offset the demure top, and matching heels.
The Don't Hold Your Breath singer wore her hair slicked off her face in a tight ponytail and added a slick of red lipstick.
Chic: The singer's thigh-skimming skirt offset her high-neck top with long bat-wing sleeves
Her fellow judge Paula Abdul also chose a demure little black and white number.
The 49-year-old wore a cute white dress with black trimming and Peter Pan collar.
Abdul added some sex factor with towering silver platform heels by Christian Louboutin and Sixties bouffant hair.
Sixties style: Paula added some oomph with her bouffant hair 'do
Fans: Paula Abdul, in a white dress with black trim and collar, greeted young fans as she arrived
Previously both judges have worn flirty styles for the auditions in Miami, and Los Angeles for Paula.
At the Miami auditions Nicole made her judging debut in a bright orange and purple outfit, that some perceived as a non-subtle reference to her predecessor Cheryl Cole's much-panned outfit at the LA auditions.
The following day she chose a gorgeous cornflour blue dress with draped material and daring neckline.
Sexy: Nicole has previously worn more revealing, colourful numbers for the auditions
Paula wore a mint-coloured strapless frock with a flouncy skirt, which Simon Cowell appeared to approve of, given the pictures of the pair flirting and cuddling at the Miami auditions.
Today following the Dallas auditions Paula tweeted: 'It's been an awesome day/night in #Dallas! hey #Texas YOU ROCK! more of the same tomorrow?'
The judges will be viewing acts during a second round in Dallas today.
Flirty: Paula also wore a sexy frock to the Miami round of auditions