Top 11 artists in their 20s

4. Miley Cyrus (24)

The "Party In The USA" singer rose to fame back in 2006 with her hit television show Hannah Montana. Since then, singer, actress and tv personality has had three number-one albums on the Billboard 200, seven top 10 entries on the U.S Billboard Hot 100 and has been ranked in Billboard's top best selling female artists of 2009.

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