On Style aired a new episode of the Jung sisters' reality program 'Jessica & Krystal' on June 10, revealing the pretty picture of Krystal on her newly obtained driver's license.

While looking at her younger sister's new license, Jessica exclaimed, "Pretty!"  She also said with disbelief, "It's really fascinating.  You got a driver's license!"  Despite her cute outburst, she petted Krystal on the head, saying with affection, "Good job!  You're all grown up now!"

SEE ALSO: Krystal says her solo album will 'hopefully' come out this year

Still, as a rookie driver, Krystal was unable to hide her nerves while driving and the girls asked for help from a worker at the gas station at one point, causing laughter.

At one point, she even calls fellow f(x) member Sulli who shows her disbelief and surprise that Krystal is driving at the moment.  At other times, Jessica and Krystal turn the car into a karaoke room!  Check out the videos below.