The 'Boomerang' singer, who debuted her new hairstyle via Twitter yesterday, looked stunning in her patterned skirt and pink shirt, teamed with Katie Rowland jewellery, as she arrived at Wembley Arena on Monday morning (15 July).
It's another scorching day in the capital so Nicole popped her sunglasses on for the photocall and while chatting with journalists at the West London venue.
The former Pussycat Doll joined the UK show last year following a stint on the US version, and immediately cemented her status as a judge to be reckoned with by mentoring James Arthur to the 2012 win and Jahmene Douglas to second place.
"I had so much fun and such a great experience on the show last year – it far exceeded all my expectations!" she said. "I always give 110% to all I do and I put everything else on hold to focus on X Factor.
"This year, now that I've worked out doing my new music and the show together, I am so excited to get back to the UK, my second home, and get stuck into X Factor 2013!"
Nicole and fellow X Factor judges Sharon Osbourne, Gary Barlow and Louis Walsh have been travelling across the UK in recent months to audition aspiring artists hoping to follow in the footsteps of previous winners like Leona Lewis and James Arthur.
For the first time this year, a two-tier audition process was introduced, meaning hopefuls not only had to impress the judges in an intimate setting, they also had to wow on the big stage.
Today, the best of the best from the small auditions will perform once more, this time in front of the judges and thousands of fans at Wembley.
Xtra Factor presenters Caroline Flack and newbie Matt Richardson were also there.