The pair connected on social media, Capital FM reports, after Horan’s cousin introduced him to Capaldi’s music some time ago.
In an interview with Glamour, Niall recounted the first time they ever met, and it was quite the story.
He said: ”First time I ever met him I just thought he was a lunatic, it was St. Patrick’s Day, we had a few beers… and we got very drunk, and then both played shows the next day.
“He’s very funny to be around, he makes me feel funnier, even though I’m not that funny at all, maybe it’s because I’m famous and he’s big into famous things these days.”
Capaldi, when asked about his friendship with Horan, replied: “All joking aside, before any of my music was doing f*** all, he was one of the first to reach out and say he loved my music and that meant a lot to me.”