Justin Bieber, One Direction: Top Billboard's '21 Under 21' List

Selena Gomez's boyfriend is the No. 1 hottest thing in the music business under 21 right now and the five singers of One Direction have just that "One Thing" that ranked them in at No. 2 on the Billboard's coveted chart.  

For the second year in a row, Justin Bieber topped the Billboard's "21 Under 21" list of the world's top young musicians.

Like Us on Facebook

He released two No. 1 albums this year - "Believe" and "Under the Mistletoe" - and Billboard said the 18-year-old "remains more powerful in the pop universe than ever." 

"Bieber is the supernova of teen pop stars with charisma, popularity and swagger to spare; it's Biebs' world and we're lucky to live in it," they added.

The Express Tribune reported that the British sensation taking the U.S. by storm, One Direction, came in No. 2 on the coveted chart. The band's five singers range from ages 18 to 20 and have captivated fans with hits such as "One Thing" and "What's Makes You Beautiful."

They sweeped the MTV Video Music Awards this recently as well, beating their UK rivals the Wanted and taking home perhaps one of the most sought after awards of the night: Best New Artist. 

See who else made the Billboard list.

3. Demi Lovato

4. Scotty McCreery

5. Mac Miller

6. Selena Gomez

7. Porter Robinson

8. Cher Lloyd

9. Earl Sweatshirt

10. Nick Jonas

11. Jackie Evancho

12. Cody Simpson

13. Mindless Behavior

14. Megan & Liz

15. IU

16. Bridgit Mendler

17. 3BallMTY

18. Miley Cyrus

19. Madeon

20. Ross Lynch

21. Victoria Justice