Jessica congratulated Krystal on her birthday with sweet posts!

On October 24, Krystal celebrated her 23rd birthday. In celebration, her older sister Jessica dedicated the cutest Instagram stories.

The first story showed a goofy selca of Jessica and Krystal.

Jessica added a sweet note, saying, "Happy Birthday darling", on the second story.

Last but not least, the third story showed Krystal giving her sister a manicure. The caption reads, "Happy Birthday!"

These two are definitely sister goals! Happy Birthday, Krystal.