The One Direction lads have shared tributes to each other, their fans and their success on social media today as they celebrate 10 years since the band was formed on The X Factor.
Sharing a photograph of his bandmates on Instagram Harry Styles wrote that he "couldn't be prouder" of his former One Direction bandmates as the group celebrated their 10th anniversary.
The group, which was originally comprised of Styles, Niall Horan, Zayn Malik, Liam Payne and Louis Tomlinson, was formed by Simon Cowell on The X Factor.
Marking the milestone, Styles said he had been "struggling to put into words how grateful I am for everything that's happened over the last ten years".
He added: "I've had the pleasure of meeting and working with some of the most incredible people, and gained friendships that I know I will treasure for the rest of my life.
"None of this would be possible without the support you've given along the way.
"And for that, I will be forever thankful."
Styles said he "can't believe it's been ten years" and signed off his message saying: "And finally, to the boys, I love you so much, and I couldn't be prouder of everything we achieved together."
Payne also marked the anniversary on Instagram, sharing a screenshot of a text message he sent to his father on the day he joined One Direction, reading: "I'm in a boyband."
"What a journey... I had no idea what we were in for when I sent this text to my dad years ago at this exact time the band was formed," he said.
"Thanks to everyone that's supported us over the years and thanks to the boys for sharing this with me."
Horan also shared a photograph of the band on stage together as he reminisced about the "unbelievable memories" they had together.
He wrote on Instagram: "When I met these four gents there was no way I thought we would go on to do what we did.
"We felt the adoration of millions from around the planet on a daily basis and it was mind blowing."
Tomlinson shared the first-ever picture of One Direction and wrote: "Our first ever photo together. The memories we've shared together have been incredible.
"Can't believe its been 10 years already. I look back incredibly proud. Thanks for everything lads and love to you the fans as always x
The band went on hiatus in 2016, while Malik departed the group in 2015. Their last televised performance together was in December 2015.
As part of their landmark anniversary, the band launched a special '10 Years of One Direction' website on July 23, the official date of their anniversary.
A candid behind-the-scenes video marking their career, as well as reformatted EPs featuring B-sides and rare songs, remixes, live recordings and acoustic versions of songs were also made available online.