The 'Boomerang' singer rocked up to the ExCel Centre in Docklands looking flawless in a little black leather dress and killer orange heels that showed off her incredible legs.
Nicole has looked nothing less than amazing at all the X Factor series ten auditions so far. They kicked off in Glasgow earlier this month, and later took in Birmingham and Manchester on the search for a new star.
No doubt Nicole will be keen to impress again this year. She was the winning judge on the ninth series, thanks to her singer-songwriter act James Arthur, while her other finalist Jahmene Douglas finished runner-up.
Fresh from her appearance at the Daytime Emmys in Los Angeles at the weekend, returning judge Sharon Osbourne also went for a black outfit, arriving in a suit and white shirt.
Sharon was last seen getting frisky with husband Ozzy as they walked the red carpet at the glitzy TV ceremony in Beverly Hills on Sunday (16 June), where Sharon's US chatshow The Talk picked up several awards.
Rounding out today's fashion parade was Xtra Factor host Caroline Flack, who returned to her trademark shorts, blazer and bare legs combo.
As we told you last week, a white blazer is the perfect way to achieve a smart, summer look. Fellow celeb fans include Jennifer Lopez and Holly Willoughby.
Gary Barlow and Louis Walsh - wearing a bright purple jacket - were also all smiles on the red carpet, as was Caroline's new Xtra Factor co-host Matt Richardson.
Matt was brought in to replace Olly Murs, who is busy with his new music and a massive tour with Robbie Williams, not to mention finding success over in America.
Will any of this year's hopefuls be so lucky?