Winner: Carrie Underwood Winning her season catapulted the Oklahoman from country girl to country music royalty, and her 2005 debut album, Some Hearts, went seven-times platinum. Since Idol, Underwood has sold more than 12 million albums worldwide and won six Grammys. There is no stopping this vocalist and you can bet her hubby, NHL player Mike Fisher, will be among the devoted fans cheering her on.
Runner-Up: Bo Bice Bice's first album, The Real Thing, debuted at No. 4 on the charts in 2005, but his star has been on the decline ever since. The Alabama native has been lucky in love -- marrying longtime girlfriend Caroline Fisher and becoming a two-time dad. But he's been less fortunate in the music industry since Idol first made him (and his long hair) famous: His second album sold less than 65,000 copies.