Justin Guarini may have started his career on American Idol, but now he's rocking out on Broadway in American Idiot. Guarini took a break from his busy schedule (his wife is several months pregnant!) and dropped by Broadway.com's video studio to answer readers' questions. Take a look below as Guarini discusses everything from working alongside his Idol pal Kelly Clarkson in the film From Justin to Kelly, his favorite Green Day songs and much more.