Related Information for Jessica Jung Jessica Jung (제시카; born April 18, 1989, in San Francisco, California) is a singer, actress, model, spokesmodel, businesswoman, and former member of the South Korean idol group, Girls' Generation. She is also the older sister of f(x) member Krystal Jung.Having moved to South Korea when she was 11, Jessica trained for 7 years before being placed in Girls' Generation (소녀시대), and went on to debut in 2007. She has been praised for her talent on stage and exceptional voc.. read more