Note to Kim Kardashian and Kate Middleton: Better start lobbying now! Working Mother magazine announced its annual list of the 50 Most Powerful Working Moms on Monday, May 6, and not suprisingly, there are business execs and politicians galore on the impressive roster. But household names Jessica Simpson, Beyonce, and Jennifer Lopez also made the list, even cracking the top 10!

"[This] group of American working moms screams power," says Working Mother Media Editorial Director Jennifer Owens. "They absolutely have talent, influence, status, money and smarts, but theyâ