Nothing has been confirmed yet but just look at how often they post about each other!
2017 was a great year for my career . I really appreciate all the love and support . Still can’t believe I get to do this for a living . This year I’ve done stuff I never imagined and it’s all thanks to you guys . Made an album, went on a tour , promotion all over the world , won awards and none of it is possible without you . Can’t wait for 2018 and to get back on the road and play for thousands and thousands of you all over the world . Again, thank you for everything and i’ll see ya soon. Love you x
A post shared by Niall Horan (@niallhoran) on
While most people just assume that they're good friend we can't help but notice how often they get cosy together at concerts.
And Hailee's latest Instagram post has fueled the rumors even more.