One Direction have been named Billboard magazine's most powerful musicians under the age of 21 years.

The boy band topped the music industry bible's list of the 21 most powerful names in music under the age of 21. The annual list takes record and ticket sales and social networking statistics into consideration.

Justin Bieber came in second place followed by Miley Cyrus in third. Former X Factor singer Cher Lloyd also appears on the list in 11th position.