Beyonc Knowles has always held her privacy dear. She's a stingy interview subject -- polite but unfailingly circumspect -- and she's just as guarded when it comes to her art: As a member of Destiny's Child and, now, a hugely successful solo star, she's never been one to sing about her most intimate thoughts and feelings. It's hardly hurt her commercially, of course: Selling sex and female-empowerment anthems, Beyonc, 27, has become one of the biggest stars in modern pop culture, placing fourth -- behind Oprah, Tiger and Angelina -- on this ... (more)