From knowing Taylor Swift's cats' names to being able to list her albums in order, there's more to being a Swiftie than just loving the music.
Taylor is now well into the European leg of her Eras Tour and we're sure that Taylor fever will take over Dublin when she performs at the Aviva on June 28, 29, and 30.
So, do you think you're the ultimate Swiftie? Whether you won the Great War for tickets or not be Fearless and take our quiz to find out.
