No. 20: Ross Lynch of 'Austin & Ally'
Birthdate: December 29, 1995 (age 16)
Why He's Hot: The voice behind 12 of the 14 songs on the upcoming "Austin & Ally" soundtrack, show star Ross Lynch is on track to become Disney's next big thing. The 16-year-old actor doesn't just play a musician on the DisneyChannel, but also sings in a band called R5 with his four siblings. The group has an EP coming in 2013 and an album due late next year, both on HollywoodRecords. Lynch, who plays Austin on the Disney series, takes the lead on the show's first music video, "Heard It on the Radio," which boasts nearly 3 million views on YouTube. The show's official Lynch-led soundtrackdropped Sept. 11.