Happy birthday to the ever lovable, cute, and sassy f(x) member, Krystal!  Known to be armed with aegyo that is everyone's weakness as well as a more fierce, charismatic, and sassy side as shown through certain acting roles and her bold stage presence, Krystal has gathered a large following of fans, who happily celebrated on Twitter.

That's right!  "#HappyKrystalDay" is currently trending worldwide as fans wish her a happy birthday.  Born on October 24, 1994, she has now turned 20 years internationally, saying farewell to her teen years as she continues maturing into a classy young lady.

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Although she recently had a fainting spell that alarmed fans, she has hopefully recovered fully now, so she can celebrate her birthday!