Ailee and f(x)'s Amber displayed their friendship through selcas.

Three selcas were released through 'M! Countdown's official Twitter on December 20th. The photos were accompanied with the caption, "Amber and Ailee said they were even happier to see each other because it's been a while!".

The three photos showed Amber and Ailee posing playfully at the camera, showing their warm friendship. Fans noticed Amber's growing hair as well.

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Source: M! Countdown's Twitter