Having endorsed Calvin Klein Jeans back in August, the 3 lovely ladies from f(x) -�Krystal, Sulli and Victoria -�are donning the tight jeans once more for a new video. The three members are seen dancing to an upbeat rhythm and alluring men with their sexy poses. f(x)- Krystal, Sulli and Victoria show off their new dancing skills in the viral video, which is a collaborated effort between creative director Yongyi and Calvin Klein Jeans. Check out the video below! Source: Calvin Klein Korea