Shania Twain was one of the biggest music stars of the '90s. Well, actually, to paraphrase one of her hits, she's one of the most successful musicians of forever and for always. After moving to the U.S. from Canada, Twain paired a voice that can only be described as like Karen Carpenter's but happier with a sexy-girl-next-door vibe that transformed and dominated first the world of country music and then pop. (She paved the pay for similar transitions by people like LeAnn Rimes and Taylor Swift.) With her videos a staple on both CMT and VH1 and songs like "Man! I Feel Like a Woman," "Any Man of Mine," "That Don't Impress Me Much," and "You're Still the One," Twain spent the better part of the late '90s as one of the most famous and popular musicians in the world, reportedly selling 48 million albums along the way.