Former Pussycat Doll Nicole looked rather excited as she made prepared for her journey and managed to go pretty much incognito.
Dressed in a black coat, fedora hat and oversized sunglasses, the 36-year-old took several photos to document her journey.
Being a tourist for the day, US singer Nicole posed for a picture as the tube left the platform, but the best snaps were of Nicole taking a seat in the carriage.
Despite commuters in sight, it didn't stop Nicole from striking a schmazing pose with two legs up in the air. Captioning one photo, she said: "Tubing it. #underground.'
If that didn't attract attention then we don't know what would!
After her tube journey, Nicole enjoyed some downtime with friends as she enjoyed a Sunday roast at her local pub.
Nicole, who is dating Formula One ace Lewis Hamilton, is currently in London for her stint in West End musical Cats at the London Palladium.
Playing Grizabella in Andrew Lloyd Webber's show, former X Factor judge Nicole will be performing the role for a strictly limited 12-week run. Her final show in mid-February.
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