One Direction star Niall Horan has dismissed speculation that he is dating a "secret girlfriend".

Reports emerged recently that the heartthrob singer was in a relationship with aspiring Irish model Zoe Whelan.

She reportedly denied the rumours on Twitter before deactivating her account after receiving angry tweets.

However, Horan himself has cleared up the rumours, responding to a fan on Twitter who asked if he had a secret girlfriend:

"I don't!"

The 'Kiss You' star meanwhile also revealed to a fan what his most embarrassing tour moment has been, tweeting:

"I had tight jeans on and I went to go on the 2nd level of The stage and fell over hahah."