Jessica shared a new childhood picture of herself and beloved younger sister, Krystal, whose birthday was on October 24.

She posted the picture onto Weibo and wrote, "Happy birthday my dearest sis. There was a time when i used to be. Taller than you! [sic]."

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Jessica is indeed bigger than Krystal in the photo as they sit cutely in a fun helicopter ride! �While Jessica has a large smile and seems to be enjoying it, Krystal looks slightly scared as she sits closely next to her big sister.

Who can ever get enough of this cute sisterly love?