The Irish singer shared a selfie on himself on his Snapchat account which saw him sat on a Northern line tube with other commuters seemingly unaware of his presence, reports dailymail.co.uk.
The 22-year-old wore a green jacket and a tweed flat cap in the picture, which read: "Tube".
His fans couldn't hide their reactions to the image as one tweeted: "Imagine seeing Niall Horan on the tube. Just. Take a second and really truly imagine it."
Another quipped: "Lol at everyone on the tube that has no clue Niall Horan is a couple feet away from them."
Horan has been keeping a relatively low profile since One Direction parted ways to enjoy an extended hiatus.
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