The Wanted Loving Shocking Fans At Justin Bieber Concert: "Their Heads Exploded!"

4 July 2012, 11:49 | Updated: 4 July 2012, 12:13

The 'Lightning' singers say supporting Justin made make people realise how big the band could be in America.

The Wanted say they will never forget the reaction they had from their fans when they surprised them by performing at Justin Bieber concert in London last year.

The 'Glad You Came' stars say it was amazing to genuinely surprise their fan base, affectionally known as 'TWFanmily', as they had no idea the band were going to join the 'Boyfriend' singer on stage in late 2011 at London's O2 Arena.

The Wanted's Jay McGuiness says he saw the audience's "heads explode" when the five-piece band came out, which he loved because their fans usually know everything they are doing.

"I think part of it was the reaction and that's what kept it going, because our fans find out about everything," Jay told Rolling Stone recently. "I mean, even if it's only like ten [AM] some people will know what hotel or airport, people find our what studio, where we're going to eat. They just know. I don't know how.

"But this was the first time ever that we arrived and it was a true surprise because it was so last-minute," the 'Lightning singer explained. "So we went out and I just saw the kids' heads explode.

"Like Justin Bieber and The Wanted in one room, I think his camp saw that and thought, 'OK this is actually pretty big isn't it?'," Jay added, saying he feels the reaction helped prepare the band for their recent success in America.

Check out a picture of The Wanted on stage alongside Justin Bieber at London's Westfield Shopping Centre in last 2011 below:

The 'Chasing The Sun' stars have developed a good friendship with 18 year-old pop singer Justin since supporting him in London last year, with both acts congratulating each other on their chart successes in recent months.

The Wanted are currently back in the studio working on the follow-up to their 2011 album 'Battleground', having been joined in the studio last month by N-Dubz rapper and producer Fazer.