The teen-pop superstar asks her hero about early Green Day, staying sane in the industry, and that time he got into a fight with a guy in the audience. Get the full story at: https://bit.ly/36hflnl Subscribe to Rolling Stone on YouTube: http://bit.ly/1uGwgGg Check out http://www.rollingstone.com for the latest news in music, culture, politics and more. More videos from Rolling Stone: http://www.rollingstone.com/video Like Rolling Stone Video on Facebook: https://www.facebook.com/RollingStoneVideo/ Like Rolling Stone on Facebook: https://www.facebook.com/RollingStone/ Follow Rolling Stone on Twitter: https://twitter.com/RollingStone Follow Rolling Stone on Instagram: https://www.instagram.com/rollingstone/