Harry Styles Celebrates One Direction's Three Year Anniversary With Heartfelt Message

Harry Styles has marked the three year anniversary since One Direction were formed on The X Factor by letting his fans know how much he appreciates their support with a rather touching message on Twitter.

Niall Horan, Zayn Malik, Louis Tomlinson, Liam Payne and Harry shot to fame on The X Factor in 2010 when they auditioned for the competition as five solo artists, only to be put together as a group without realising they would become one of the most successful boy bands of all time.

While Louis celebrated the three years since he first auditioned for the ITV show earlier this month, Harry has marked the band's special occasion with a sweet message on Twitter in which he credited their fans for their achievements.

“3 years.. I honestly can't believe it. Thank you so much for everything, we're so lucky to have you. You keep making it more and more fun,” Harry tweeted this morning.

They may not have won The X Factor but the lads have released two albums, 'Up All Night' and 'Take Me Home,' the latter of which soared to number one and are currently on their first ever world tour, while also managing to score three chart-topping singles.

Harry Styles Celebrates One Direction's Three Year Anniversary With Heartfelt Message

Fans are currently going wild over the band's latest release, 'Best Song Ever,' which will feature as the soundtrack for their upcoming 3D concert movie 'This Is Us.'

The music video for the single sees the boys transformed into alter-egos including a female secretary, choreographer and a pensioner.

Here's to another three years, Directioners! Check out the 'Best Song Ever' music video below...