It's been five beautiful years since Simon Cowell put Louis Tomlinson, Zayn Malik, Harry Styles, Liam Payne and Niall Horan together as a boy band on the U.K.'s "X Factor," and the last half-century has been quite the journey for One Direction. A little fan base called the Directioners are celebrating today, crying on Twitter, baking cakes and swapping nostalgia and fan art. So while everyone is sharing their favorite 1D moments, here are some of the most iconic parts of One Direction's history. Were you here for all of them?
July 23, 2010 -- Formed
Just as they thought they were going to be eliminated from the "X Factor," Simon Cowell gathered the guys together -- and there was only one direction to go from there.
Sept. 11, 2011 -- First single
After being signed to Cowell's Syco record label, and then on Columbia in the U.S., they put out their debut single, "What Makes You Beautiful."
Nov. 18, 2011 -- Up All Night
Their first album shot to #1 in many countries all over the world and was an immediate success.
Dec. 18, 2011 -- First Tour
They boys had previously gone on tour with "The X Factor," but this time, they were on their own. Their first tour promoted their new album.
Apr. 7, 2012 -- First 'SNL'
The guys performed "What Makes You Beautiful" on "Saturday Night Live" and they also made an appearance in this sketch. Harry's dancing is everything.
Aug. 12, 2012 -- Olympics Closing Ceremony
A lot was going on for the dudes during this time, and since they are one of the biggest acts in the world, they got to rep the U.K. at the 2012 Olympics in London.
Sept. 6, 2012 -- First VMAs
Not only did they perform "One Thing," but they won awards for Best New Artist, Best Pop Video and Most Share-Worthy Video. And they got kisses from Katy Perry, who whacked Harry with the Moonman.
Sept. 27, 2012 -- Liam shaves his head
After a breakup, Liam cut his luscious hair. It was a big deal.
Nov. 9, 2012 -- Take Me Home
Their second album came out a year after their first and spawned hits like "Live Like We're Young," "Kiss You" and "Little Things."
Dec. 3, 2012 -- MSG
Their Madison Square Garden show was one of their most important ones. Fans were following along with the live tweets online as the boys took on New York. Zayn even got an "MSG" tattoo commemorating it!
Dec. 4, 2012 -- Bring Me To 1D
They wanted to meet fans all around the world, so they handed golden tickets to two people from each country to come to New York and see their "Kiss You" video before anyone else.
Apr. 3, 2013 -- Niall gets his braces off
Big moment, people.
Aug. 18, 2013 -- Zayn and Perrie get engaged
Zayn and Little Mix girlfriend Perrie Edwards decided to tie the knot. We're still waiting, guys!
Nov. 23, 2013 -- 1D Day
Before releasing their third album, the guys hosted an seven-hour live stream where they hung out with fans, wrestled and recreated the scene from "Ghost." Remember when Niall dyed his hair purple?
Nov. 25, 2013 -- Midnight Memories
"Best Song Ever" was the first single from Midnight Memories but "Diana" will always be a fan favorite.
Nov. 17, 2014 -- Four
The boys released their fourth album, aptly titled, Four. And it has be my favorite song on it: "Fireproof."
Mar. 25, 2015 -- Zayn Leaves
Although Zayn announced he was leaving early 2015, the band is still continuing. They're currently on their On The Road Again Tour.
What is your favorite One Direction moment? Tell us in the comments!