British fans of the pop star, known as KatyCats, hand over an average of £1,627 to buy her merchandise and music, and attend her shows.
Fans of rapper Kanye West spend an average of £1,563 and devotees of boyband One Direction spend £1,239.
Rihanna’s so-called Navy of loyalists, and the Beyhive - fans of Beyonce fork out £1,100 and £1,087.
The Battle of the Fan research, carried out by Barclaycard, compared the amount of money spent by self-identified “big fans” who have purchased at least three albums or singles by their chosen act, be it Beyonce, Florence and the Machine, Kanye West, Katy Perry, Lady Gaga, One Direction, Rihanna, the Rolling Stones, Take That, Taylor Swift, The Beatles or The Who.
Stones fans spend more than £150 on each concert.