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One Direction celebrated six-year anniversary on Saturday, July 23 and the hashtag #6yearsof1D trended on Twitter. Louis Tomlinson, Harry Styles, Niall Horan and Liam Payne expressed their gratitude toward fans with heartwarming messages.

Louis said in a video shared on One Direction's account, "I just wanted to film a little message to say thank you because you guys are incredible. Your continued support is remarkable, really, and every single one of you had a hand in changing our lives. I hope you're as proud as we are."

He followed it up, "Read so many amazing tweets from you guys ! Thanks for sharing the memories with us .. Here's to many more."

Louis has a message for you! #6YearsOf1D pic.twitter.com/uslf7Eglck

— One Direction (@onedirection) July 23, 2016

Harry wrote, "Six years. I have no idea how to say thank you for all your support. For everything you are, and everything you've done, thank you. H." Niall posted, "6 years . wow ! As Louis touched in his message , each one of you have played in a part in changing lives.. You are the best fans in the world as you know . . Thank you so much for everything so far."

Liam, who recently announced his solo record deal with Capitol Records, added, "Very late to the party but wow six years of us!! still so many more to come I've never been part of something so amazing."

One Direction launched a Spotify party on Saturday, playing all of their songs from their "Up All Night" to "Made in the A.M." albums.

We're kicking off our #6Yearsof1D @Spotify Party now with #UpAllNight! Join us now https://t.co/Y83pX6eRTf pic.twitter.com/pYrHHwdMU1

— One Direction (@onedirection) July 23, 2016