f(x)'s Amber sent fellow member Krystal, who recently celebrated her 18th birthday (Korean age: 19),�a special birthday message that has fans talking.

Amber tweeted on the 24th:

?? ????? ?????? ? happy bday to our princess #HappyKrystalDay twitter.com/llama_ajol/sta�

� Amber J. Liu (@llama_ajol) October 23, 2012

The photo shows Krystal's face attached to the body of a shepherdess holding an adorable "Amber llama". The caption on the photo is a combination of Krystal and Amber's name, "Kryber", has left fans smiling.

Fans commented, "Did Amber make this herself?", "[Amber] has a lot of sense", and "Happy Krystal day".

Happy Birthday, Krystal!