Britney Spears
A former Mickey Mouse Club kid whose debut single '...Baby One More Time' (September 1998) and January 1999 album catapulted her to megastardom as the defining pop voice of the millennium. TRL countdown staple, Rolling Stone covers, Pepsi deals, and cultural omnipresence through the early 2000s with 'Oops!... I Did It Again' (2000) and 'Toxic' (2003–04).