14/08/2014 12:52 BST | Updated 22/05/2015 06:12 BST

One Direction's Niall Horan Cuddles A Newborn Baby. But Whose Is It?

One Direction's Niall Horan cuddles a newborn baby. But whose is it?

Has One Direction's Niall Horan become a secret dad? Fear ye not, besotted Directioners, for this photo isn't all it seems – because the babe in Niall's arms is his newborn nephew.

Niall took a break from band duties to travel home to Ireland when his sister-in-law Denise went into labour.

He spent hours waiting for the new arrival with dad-to-be Greg, who got married four months ago.

Niall was Greg's best man and found out he was going to be an uncle at the wedding.

Beside the picture of him holding the baby, Niall Tweeted to his 12 million followers: "Congrats Greg and Denise! Wohoooo! I've got a nephew! Cutest kid ever!"

One Direction fans claim the boy has been named after the Greek god Zeus, but Greg insist they still hadn't decided what to call him.