Despite the rather chilly start to the day in the capital, the 'Boomerang' singe, 35, was snapped outside Heathrow Airport in an unusual patterned jumpsuit.
Comfortable for a long haul flight, we imagine, but maybe not ideal for the increasingly cold UK mornings!
Nicole added a pair of statement sandals to give her outfit a unique twist, finishing her look with oversized sunnies and a cute leopard print shoulder bag.
The former Pussycat Doll has been over in LA while the audition, boot camp and judges' houses episodes of X Factor aired on our screens, but now she's back in England and ready to get to work.
Last night she shared a photograph of herself hanging out with music producer Tricky Stewart and his wife, saying: "#latergram My last night in LA before my move to London!"
Nicole is mentoring the girls category this year and will be hoping to make it a second successive year as a victorious judge, following her act James Arthur's win last year.
This weekend, we saw Nicole jetting the top six girls to gorgeous Antigua where she was joined by Mary J. Blige for some help in deciding her final three.
In the end she opted for Abi Alton, Tamera Foster and Hannah Barrett in an emotional episode that saw her letting returning contestants Jade Richards and Melanie McCabe go home.
X Factor's live shows kick off Saturday, 12 October with a 1980s-themed episode on ITV.
Check out the full top twelve acts for live shows in the gallery below:
Copyright: ITV Tom Dymond/Thames TV