Lovato has released six studio albums: Don't Forget (2008), Here We Go Again (2009), Unbroken (2011), Demi (2013), Confident (2015), and Tell Me You Love Me (2017); all of which debuted in the top five of the Billboard 200. She has earned nine top-20 tracks on the Billboard Hot 100 with "This Is Me", "Here We Go Again", "Send It On", "Skyscraper", "Give Your Heart a Break", "Heart Attack", "Cool for the Summer", "Sorry Not Sorry", and "I Love Me". In total, she has sold over two million albums and 20 million singles in the United States. On television, Lovato has starred as the titular character on Sonny with a Chance (2009–2011), served as a judge and mentor on The X Factor USA in its second and third seasons, and appeared as a recurring character on Glee. Her struggles with several personal issues received significant media attention in the 2010s; in response to which she published the book Staying Strong: 365 Days a Year (2013) and released a YouTube documentary about her life and career, titled Demi Lovato: Simply Complicated (2017).