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 maknae Seohyun'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."  

SEE ALSO: Fans gather funds to plant a 'YoonA forest' in honor of her birthday

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

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� ??(???) (@sjhsjh0628) May 30, 2014