21 Under 21: Selena Gomez
21 Under 21: Selena Gomez

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.

Video Below: Selena's "A Year Without Rain"

Next: Justin Bieber