No. 12. Il Volo
Birthdates: Gianluca Ginoble - Feb. 1, 1995 (age 16); Piero Barone - June 24, 1993 (age 18); Ignazio Boschetto - Oct. 4, 1994 (age 16)
Why They're Hot: After appearing on 'American Idol' in May 2011, the young operatic tenors of Italian trio II Volo set themselves up for a media whirlwind that included an appearance on 'Ellen' and a coveted spot on the series finale of the HBO smash 'Entourage.' Consisting of Piero Barone, Ignazio Boschetto & Gianluca Ginoble, the classically trained trio is currently on a U.S. tour. But the proof of the group's success is really in the charts: partially on the strength of single "O Sole Mio," the boys' self-titled album hit No. 1 on Billboard's Classical Albums chart in September, and sales are still going strong.