Although Beyonc Knowles is not yet 30, the sensual superstar has already succeeded on many levels: as a dancer, singer, composer, model, music producer, video director and actress. Like rap star/entrepreneur Jay-Z, with whom Beyonc recently married, she has evolved into a businesswoman, who with her designer-mother, Tina Knowles, markets Beyonc 's personal fashion line, House of Dereon. The multi-talented, global entertainer lends her name and...