Girl's Day's member Hyeri showed off her sister on the April 14 episode of KBS 2TV's 'Happy Together 3'!  A picture taken with her sister was shown, impressing everybody with their great gene pool.

She revealed, "My younger sister is preparing to become a stewardess."  The picture of her sister shows how she could be a part of a girl group and looks just like Hyeri, too.

SEE ALSO: Hyeri becomes free agent after parting ways with Creative Group ING

The other people on the show teased her with, "The younger sister seems more like the older sister."  Hyeri agreed with, "That's right.  We hear that a lot.  She's 21 this year.  She told me that she was directly and personally called by the broadcasting company.  Asking her to come out on a program.  I tried telling her that I could go out with her, but she's extremely shy.  I even asked her in advance if I could talk about her on the show and got her permission."  Looks like her sister is a very private person, then, and has no interest in joining her sister in stardom!