Demetria Devonne Lovato ( lə-VAH-toh; born August 20, 1992) is an American singer, songwriter, and actress. She began her career as a child star on the television series Barney & Friends, and received her breakthrough role starring in the lead role of the Disney Channel television film Camp Rock (2008). The film's soundtrack included Lovato's debut single, "This Is Me", which peaked in the top ten on the US Billboard Hot 100. The success of the film and its soundtrack led her to a recording contract with Hollywood Records. From late 2008 to early 2011, she began an official music career and continued appearing on Disney Channel, releasing the studio albums Don't Forget (2008) and Here We Go Again (2009), starring in the lead role on the television series Sonny with a Chance (2009–2011), and appearing in the television films Princess Protection Program (2009) and Camp Rock 2: The Final Jam (2010).
After completing treatment for a series of personal struggles, Lovato released her third studio album, Unbroken, in late 2011. The album addressed several of her struggles and contained two singles, "Skyscraper" and "Give Your Heart a Break", both of which peaked in the top twenty of the US, with the former charting in the top ten and the latter being certified Triple Platinum in the country. Lovato became a judge and mentor on the second season of the U.S. version of The X Factor in 2012, and returned for the shows third season after the release of her fourth studio album, Demi (2013), which debuted in the top three of the US Billboard 200, while its lead single, "Heart Attack", became her third top ten entry in the US.
After co-founding Safehouse Records in 2015, Lovato released her fifth studio album, Confident, later that year. The album was noted for its mature themes and earned Lovato her first Grammy Award nomination, while its lead single, "Cool for the Summer", peaked in the top 12 of the US. She followed the theme of Confident for her sixth studio album Tell Me You Love Me (2017), which incorporated a "more soulful vibe". It became her first album to be certified Platinum in the US, while its lead single, "Sorry Not Sorry", became her highest charting entry in the country, peaking at number six.
Lovato has won numerous awards and accolades, including an MTV Video Music Award, 13 Teen Choice Awards, five People's Choice Awards, an ALMA Award, a Latin American Music Award. She also holds one Guinness World Record. In addition to music and acting, Lovato has become known as an advocate for mental health awareness and other social causes, having struggled with bipolar disorder and addiction; in response to which she released the documentaries Demi Lovato: Stay Strong (2012) and Demi Lovato: Simply Complicated (2017), as well as the book Staying Strong: 365 Days A Year (2013). In 2013, she was cited for her dedication as a mentor to teens and young adults with mental health challenges at the National Children's Mental Health Awareness Day annual event. In 2014, she became the face of the Human Rights Campaign's Americans for Marriage Equality Campaign, and in 2016, she was honored with the GLAAD Vanguard Award for her services to LGBT activism.