On January 2, Hyoyoung posted a black and white image via Instagram with the caption, "2018 three sisters. The second child, first child, and the third. I'm the shortest of the three. Maknae is already 16-years-old... And I can't believe we're 26...."

Hyoyoung, Hwayoung, and their youngest sister 10 years their junior are captured flashing a bright smile at the camera. 

How lovely!