But the Dublin-born musician has never lost touch with his roots; roots which inspired a huge love for Manchester United during childhood.
Last year, the official club magazine, Inside United, caught up with King to talk about the unique connection between the club and its Irish support.
The singer also told us about meeting Sir Alex Ferguson, the painful birth of his United tattoo and the enduring legend of George Best...
Why did you first start supporting United?
“My father was a lifelong United fan, so I was born a United fan.