Before launching into an acoustic version of This Town, Niall said: 'I’d like to dedicate it to the people who lost their lives in Manchester last week. It was a very sad thing, so the least I could do is dedicate a song.'
No doubt the devastation hit him hard - Niall is good friends with Ariana Grande, who had just finished her show when the tragedy took place.
After the super emotional performance, the former 1D'er launched into Slow Hands and On The Loose and TBH we're kicking ourselves we weren't there for it.
He even bought pizza for his fans who had camped out for days just to see him.
'Look at where we are, in the center of the universe,' he said. 'Where are all the people that have been here since like, last week? Thank you for being here, really appreciate it.'
<3 you Niall.