The 'Boomerang' singer kept all eyes firmly on her when she arrived at the May Fair Hotel in central London on Thursday afternoon (29 August) looking a-mazing (or should we say sch-mazing?) in a navy strapless jumpsuit from Three Floor's AW13 collection and killer red heels.
Showing her Hollywood cool, Nicole – who jetted into London yesterday - kept her oversized shades on for some photos.
The former Pussycat Doll had spent her morning relaxing before the big launch, telling fans she'd been jogging around Regent's Park.
Chatting X Factor this week, Nicole said: "Myself and the judges have had so many laughs. We've been absolutely bonkers, it's beyond schamaze."
She'll be hoping to repeat last year's success this year: she won the show with singer-songwriter James Arthur in 2012. Not bad for her debut series as a UK judge!
Fellow judges Sharon Osbourne, Gary Barlow and Louis Walsh were also on hand for the press event, with Sharon also arriving in a pair of shades.
Sharon has returned for the show's tenth season following her departure as a judge back in 2008.
"I'm ecstatic to be reunited with my little Lou Lou!" she said. "We're all having such fun together it's a pleasure. There's a great chemistry between all four of us."
Gary, meanwhile, has a clear idea of who should win the show - and admitted he was surprised last year when viewers agreed with him.
"I don't believe a novelty act will ever win this competition because when it comes down to it, I do actually believe in the people who are voting to choose the right person," he said. "I was quite shocked that James Arthur won last time, not because he wasn't the best, but because he is the best and was the best."
As for who will win this year, Louis said: "It's not just a singing competition, it's about everything. They need to be amazing and they need to have something different."
Looking equally stylish at today's press launch was Xtra Factor host Caroline Flack, who went for her usual leg-flaunting look of a short skirt. She was joined by her co-presenter Matt Richardson.
X Factor kicks off on Saturday, 31 August on ITV1.
Watch a trailer for X Factor's new series below: