One Direction No. 1 In 21 Under 21 List

One Direction have been named No. 1 in Billboard's annual 21 Under 21 list.

The list ranks young artists on such factors as music sales, tours and social media influence.

Justin Bieber came in second on the list and Miley Cyrus was third. Ariana Grande and Earl Sweatshirt round out the top five.

Other contenders include Scotty McCreery, Cody Simpson, Austin Mahone and Cher Lloyd.