But Corden had the last laugh, as the inking took a good three weeks to wash off the One Direction star's posterior.
The only member of the British boyband to not have a tattoo, Niall was probably a bit worried this little joke would make a lasting impression.
He's got a face like a slapped... Niall Horan's jokey tattoo of James Corden's mug took three weeks to wash off
The Irish singer's lack of bodily etchings were called into question by the loveable host, who then asked if his visage could be transferred onto the popstar's body.
Detailing the funny ordeal, James told The Sun: 'We made a thing on the show that he's the only member of the band without a tattoo. I said to him, 'We've got this idea of putting a tattoo of my face on your body'. Niall went, "You should put it on my a**e"'.
I thought this was semi-permanent? Niall kept Corden updated on the fading progress of his etching
"We tattooed it on his left buttock - it took him three weeks to get rid of it. He sent me an update every week, with a photo of my fading face on his a**e saying, "It's still not gone yet".'
Niall returned to Britain on Monday after months touring America with One Direction, ending with a performance at the Teen Choice Awards with their newest single Best Song Ever.
The boys went away with four of the famous surfboards after winning Choice Music Group, Choice Music Tour, Choice Single by a group for Live While We're Young and Choice Love Song for Little Things.
Solo: The Irish singer landed at Heathrow airport but didn't seem to be with his other bandmates
One wonders which member drew the short straw and didn't get to take home a board, but after tweetin about the awards, it seems Niall may have taken all of them.
'By the way! Again, thank you so much for yesterday! 4/4 awards! Amazing! Thank you! Don't know where I'm gona fit those surf boards at home (sic),' he tweeted on Monday.
The popstar seemed to arrive without the rest of One Direction, but he still enjoyed a nice BBQ amongst friends upon his return: 'So good t just chill out! Big up to willie Devine for makin a badass BBQ ! The crew are over.'
Winners: One Direction took home four Teen Choice Awards on Sunday night in Los Angeles