f(x)’s Krystal and Jessica proved once again that they’re the embodiment of #SiblingGoals!

On April 18, Jessica rang in her 31st birthday (by international reckoning), and Krystal took to Instagram to celebrate the occasion with a display of affection.

The idol-turned-actress posted two adorable photos of herself with her older sister, which she decorated with a few vibrant splashes of color, the words “birthday girl” and “Happy Birthday,” and a festive birthday cake emoji atop Jessica’s head. She also wrote in the caption, “ily [I love you] sis.”

Shortly afterwards, Jessica returned the love by responding to the post with a heart-filled string of emojis.

We hope Jessica had a very happy birthday!

Watch Krystal in her latest drama “The Player” with English subtitles here:

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