The X Factor judge may have tried to blend into the background with her hoodie and baseball cap, but there was no denying the superstar behind those sunglasses on Friday morning (31 January).
Nicole, 35, was snapped at SoulCycle in West Hollywood, where she fitted in a workout before meeting a friend for a spot of shopping.
Just a few days ago, she had tweeted at fans: "Double work out today, trying to get this okole back in shape!" She then added a photo of some sushi, saying: "Had about a dozen of these puppies after! #handroll suckas!"
Earlier today, beautiful singer Nicole jetted into the UK from Los Angeles on a business trip, looking cute in a fuzzy yellow off-the-shoulder jumper.
It hasn't been announced yet whether Nicole will be returning to X Factor for another series as a judge, although a recent report in The Mirror claimed X Factor mogul Simon Cowell is hopeful she'll commit to another run.
A source said: "She is so highly thought of by him that it is quite unbelievable. She is thought of as one of the family. Simon loves her both on screen and off and feels she has been extremely popular with the viewers.
"He is getting in quick because he doesn't want to lose her to other commitments she has."
Among those other commitments is a collaboration with British fashion brand Missguided.co.uk, which hits stores in March.
Nicole will join forces with the company for a 30-piece collection featuring dresses, jumpsuits, skirts, tops and bodysuits.
"I'm so excited to be collaborating with Missguided!" she said earlier this year. "I've worn their clothes in the past, as I'm a big fan! This is my first time designing my own collection and I can't imagine a more perfect fit than Missguided."
She's also promised fans new music in 2014.
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Watch Nicole's video for 'Boomerang' below: