Girl group f(x) is celebrating their sixth anniversary, and member Amber has posted a message of thanks to fans on her Twitter!

The group released their first single “LA chA TA” on September 1, 2009 and then performed it for the first time on a music show on September 5 when they took to the stage at MBC‘s “Music Core.” They’ve gone on to become hugely popular in the past six years, with hits like “Nu Abo” and “Hot Summer.”

Soon after midnight on September 5, Amber tweeted a note for her fans in English with the caption “6 years old :).”

amber fx

f(x) are currently preparing for their comeback as a four-member team after the withdrawal of Sulli. Amber, Luna, Krystal, and Victoria are reportedly set to begin filming their comeback music video on September 11.

Happy anniversary, f(x)!

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