Perrie Edwards, Jade Thirlwall, Leigh-Anne Pinnock and Jesy Nelson have been filling our lives with amazing music, fabulous fashion and general hilarity for four whole years.
And because they're generous types, the girls have invited every single one of their Mixers to join in on the anniversary fun with a live stream.
The band announced the exciting news on Facebook, because lets be honest no one has time to write out that amount of invites.
The post said: "Mixers! BIG NEWS!! To celebrate our four year anniversary together, we are having a global live stream fan event in New York City with AOL and NBCUniversal!"
The exclusive, global event takes place on Wednesday 19 August, and who knows what antics the girls have up their sleeves. To get all the updates simply RSVP on Facebook.
Oh it's enough to make you feel all emotional and nostalgic, isn't it?
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