Hyunyoung shared images from the event with the followers of her personal Instagram account, captioning the set with a series of hashtags writing out: "Rainbow forever. Yoonhye unnie, happy birthday. Kim Jaekyung, Go Na Eun, Oh Seung Ah, No Eul, Jung Yoonhye, Kim Jisook, Jo Hyunyoung. HBD."
In the images, the ladies are all sitting together in a cafe, preparing to enjoy some birthday desserts.
Check out the Instagram post below!