And just to prove that the love runs deep, they even sung his song The A Team at their gig in Anaheim, California.
Niall was nominated by his fellow bandmates to sing a snippet of his favourite Ed Sheeran song (as requested by a fan) however after a moment, they all decided to join in.
Liam and Zayn kept it simple by providing a bit of harmony, Louis actually didn't sing out loud, but we're sure was humming along, and then.. Harry Styles came in.
What do you think of Niall's rendition of The A Team (with a little help from the rest of the lads of course)?
We thought it was a beautiful moment, but was Harry maybe a little too loud?
Sound off on Twitter @Sugarscape, please.