Geri Halliwell described herself as feeling like "a Londoner" after taking her first Tube journey in nearly two decades.
The 40-year-old Spice Girl was so delighted with her short journey on the Piccadilly Line that she sent a series of tweets describing her experience - complete with tips on how to use the Underground.
Geri posted a picture of herself standing on the platform at Leicester Square, wearing a camouflage jacket and brown boots, with the message: "Not so bad!!".
A photograph of her emerging on to the street at Piccadilly Circus - a journey that takes one minute, according to the Transport for London website's journey planner tool - then followed, with Geri writing: "Loved it!!i'm a Londoner! I'm liberated!!".
The mother-of-one put up another photograph of her sitting on the Tube, partly covering her face with a copy of the Financial Times, and apologised for taking so long to use public transport.
"Forgive me for being a brat:-after 17 years & yesterday's 2 hrs of traffic-lets save time & money-the tube!", she wrote.
The Look At Me singer then penned a series of tips to others not familiar with using the London Underground.
She wrote: "Tube tip - doors stops at platform entrance,or below sign ,more seats at end carriage.oh & it's not smelly just saying."
Twitter users were equally amused and bemused by the singer's messages.
@MissAnnebelleL asked: "Is Geri Halliwell going to explain how we top up our oysters next?" And @Done_Can said: "I'd love to see Geri Halliwell travel on the megabus. Wouldn't be so chipper then!".