Girls' Generation celebrated member YoonA's birthday on May 30!  Clearly having a fun time, they posed cutely for various pictures, which were then uploaded onto maknaeSeohyun's Twitter.

She wrote with an abundance of affection, "Today is YoonA's birthday.  I'm happy I stuck to YoonA's side all day on her birthday.  You have no idea how nice it is to celebrate every year like this."  

She added,"Sorry to the three unnies who were not in the picture with us because of rehearsals.  Photo by Tiffany."

오늘은 윤아언니의 생일~~! 언니 생일날 하루종일 붙어있어서 행복해요♥ㅋㅋ 이렇게 매년 축하할 수 있어서 얼마나 좋은지몰라요~!! 연습하느라 같이 사진못찍은 세언니들 sorry!!ㅜㅜ photo by 파니언니♡ pic.twitter.com/cn1oPelKrx

— 서현(서주현) (@sjhsjh0628) May 30, 2014