Girls' Generation's members throw Yoona a birthday party on 30th May.
Taeyeon updated her Instagram with the message,"Yoona, unnie loves you a lot #happyYOONAsday".
Girls' Generation's members include Hyoyeon, Seohyun, Tiffany, Sunny and Taeyeon are seen posing happily with the birthday girl in the photo above.
Happy Birthday to Yoona and wish her all the best!