Selena at 3!!

Billboard.com released their list of top 21 Under 21 music stars which is based on the stars' potential to rule pop culture over the next 12 months. Selena came in at # 3 in the list which Amazing, Just behind Justin Beiber and Taylor Swift and they are huge names in the music industry! Check out the full list here

No. 3: Selena Gomez

Birthdate: July 22, 1992 (age 18)

Why She's Hot: Selena Gomez is best known for starring on Disney's "Wizards of Waverly Place," but her pop music prowess grows every day. The just-turned 18-year-old and her band the Scene's sophomore album, "A Year Without Rain," is poised for a top 10 arrival on the Billboard 200 next week, while the title track just debuted in the top 40 of the Hot 100. Miley Cyrus might be the apple of every paparazzo's eye, but this Disney diva -- with her ultra-catchy dance-pop and girl-next-door demeanor -- is poised for a truly bright first year of adulthood.