From singer to actor and now fashion designer; no wonder 29-year-old Beyonce Knowles lacks time to concentrate on married life with rap star husband, Jay Z. Seems like things are about to change though. The singer told In U.S Style: 'When you're young -18 or 19 - you have the energy and drive. That's the time to work as hard as you can.Now I'm a woman, and because I gave it my all, I can focus on my marriage. I can decide I want to have kids. I can be the mother I want to be and dedicate myself to my children.'