But now One Direction is to have its first real Bhoy.
One of the fabulous five will next month pull on green and white hoops and run out at Celtic Park.
Louis Tomlinson will play in the Stiliyan Petrov #19 Legends' charity match on Sunday, September 8.
The game is a tribute to the Bulgarian international, who retired from football at the end of last season after developing leukemia.
Tomlinson and other players hope to raise cash for good causes nominated by Stiliyan, including others diagnosed with cancer, and for a new foodbank to open in the north-east of Glasgow in September.
The 21-year-old hit the headlines earlier this year when he signed for his beloved Doncaster Rovers despite a exhausting touring schedule with the band.
Officially a non-contract player, Tomlinson - a lifetime fan of the team - is considered a "development player" but has been given the squad number 28.
Tomlinson signed for Rovers after he performed well at a charity match at Keepmoat. He has a long association at the club, including a spell working as a waiter in its corporate hospitality section.
Club bosses will hope Tomlinson proves a crowd-puller. Last week One Direction lured 18,000 people to the studios of the Today show in New York's Rockerfeller studio.
The crowd is thought to be the show's biggest ever.
One Direction - who made their name after they were brought together for the 2010 X Factor on ITV - are now among the biggest bands on the planet.
Petrov - known affectionately by Celtic fans as "Stan" - left the Parkhead club seven years ago for Aston Villa but has never lost his love of the city.