"The media has a way of pouring things on people when they’re in a bad place. Justin’s a teenager. I called him, I told him, 'Look, when I was a teenager, I did stupid stuff too. That’s what you’re supposed to do as a teenager. The job is to learn from the stupid mistakes that you make. Now you’re about to become an adult. You can’t make the same mistakes that you’ve made now. Learn from it, grow up, move on.'" Comedian Kevin Hart has become a mentor to troubled teen idol Justin Bieber.