Niall Horan did the sweetest thing for his fans camping outside Jimmy Fallon

Ah sure, his mammy would be proud.

Niall Horan has been off gallivanting promoting his debut single, This Town since its release in September and last night he made an appearance on The Tonight Show with Jimmy Fallon.

Tonight on the show: Michael Fassbender, Jon Glaser, @NiallOfficial performs and more #12DaysOfChristmasSweaters! #FallonTonight pic.twitter.com/kpUE9WYfKW

— The Tonight Show (@FallonTonight) December 13, 2016