My, but Niall Horan is a busy fellah. I mean, if he actually dated all the people he's reputed to be dating (Jose Mourinho's daughter is among the latest) there'd be absolutely no time to repeatedly tour the globe. 

There had been rumblings that he'd been cosying up with Ariana Grande after being seen sloping out of her gaff in the wee hours...

And this is what they were doing, through the magic of instagram. And Helium balloons. And presumably perhaps other substances.