17. Britney Spears
She's currently back on the rise after the success of her latest album Femme Fatale, but early in the 2000s, her stardom couldn't even be topped. She was the decade's biggest sex symbol with equally enticing singles, including and especially, "I'm A Slave 4 U."
DECADE ACHIEVEMENT: Coming back from a mental breakdown and settling down with a stable man who isn't the poor man's Vanilla Ice.