At 16, Justin's working more than many adults, but he tries to hold on to his youth while he can. "We try to take off at least one day a week for me to be a regular kid, go play basketball, hang out with my friends and, you know, just do what I like to do," he says. "Sometimes for that day I just sleep all day because the six days before I'm exhausted."
With all the world travel, sold-out concerts and magazine sales, what's the most excited thing Justin says has happened to him? "I got to perform for President Obama!"
As for the screaming fans, Justin says he's still getting used to them. "It's pretty hard to comprehend. Like everything's just kind of surreal," he says.
So why does he think teen girls are screaming and crying when they see him? "I have no clue!"