The birthday's keep coming as Girls' Generation's Seohyun celebrated the group's Dancing Queen Hyoyeon on her birthday on social media.

Posting a selfie photo of herself and Hyoyeon, the women are wearing their stage outfits for their recent hit "Lion Heart."

"Happy birthday, Hyoyeon unni. #HyoHyunSisters" posted Seohyun on her Instagram on Tuesday along with a picture.

Hyoyeon celebrated her 27th birthday on Tuesday, September 22nd.

"So cute," "Girls' Generation members love each other," and "Both of you are so pretty," wrote users on Instagram.