The 'Boomerang' singer was seen out and about in the capital on Tuesday (18 June) doing a spot of shopping in Mayfair wearing dark skinny jeans, a leather jacket, trainers and a baseball hat.
But even dressed down and hidden behind dark glasses there was no mistaking who she was!
Nicole is in London ahead of the next round of X Factor auditions, which kick off today at the ExCel Centre in Docklands. No doubt she'll turn up looking amazing in yet another fabulously glamorous outfit!
Nicole and fellow X Factor judges Gary Barlow, Sharon Osbourne and Louis Walsh are currently auditioning hopefuls across the country for the tenth series of the talent show, which will air on ITV later this year.
Auditions kicked off in Glasgow earlier this month and have so far taken in stops in Manchester and Birmingham as well.