#6. Taylor Swift (22) 

At 20 years old, Taylor Swift became the youngest artist ever to win a Grammy for Best New Album for her second studio effort, Fearless. It's just one of the six (yes, six!) Grammy awards she's earned to date. With an uncanny ability to spin heartbreak into music gold, the country pop star's latest album Speak Now found success on the Billboard charts and her Speak Now World Tour was ranked #5 on Billboard's 2011 Top 25 Tours list. 

In her "downtime" Taylor has managed to crank out her own fragrance, Wonderstruck, and is the face of CoverGirl.