The 'Boomerang' singer showed off her incredible legs in skin-tight leather trousers paired with fab black boots, and injected a pop of colour into her look with a cobalt blue shirt.
Nicole also tried the old shoulder-robing trend, draping her black-and-white coat over her shoulders. She went for a similar look at the first set of auditions in Glasgow on 4 June.
The former Pussycat Doll wore her thick hair in a top knot at the last round of auditions in Birmingham, but this morning she left it loose, wavy and glossy around her face.
Despite the rather gloomy weather she also rocked a pair of sunglasses on arrival. Wishful thinking that the sun might come out later or just rock 'n' roll cool?
Sharon Osbourne was also on hand to judge this year's Manchester hopefuls, after jetting back into the UK from New York, where she'd joined husband Ozzy at a Black Sabbath album launch.
Gary Barlow and Louis Walsh completed the judging lineup.
Xtra Factor presenter Caroline Flack looked gorgeous in her summery printed dress. Like Nicole, she was clearly hopeful the sun would be coming out later. She was joined by new co-host Matt Richardson.
The X Factor started the filmed auditions part of this year's show in Glasgow.
Sharon has returned to X Factor after a few years away to replace departed judge Tulisa, while Matt is the replacement for Olly Murs on Xtra Factor.