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 as Mitchie Torres in 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 10 on the Billboard Hot 100 in the United States. She signed with Hollywood Records and continued appearing on Disney Channel between 2008 and 2011, releasing the 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).
Amid a series of personal struggles, Lovato released her third studio album Unbroken (2011), whose singles "Skyscraper" and "Give Your Heart a Break" were both certified platinum in the United States. She served as a judge and mentor on the second and third seasons of the U.S. version of The X Factor between 2012 and 2013, and returned to acting with a recurring role on the musical television series Glee between 2013 and 2014. Lovato's fourth studio album Demi (2013) debuted in the top three of the Billboard 200 chart in the United States, while its lead single "Heart Attack" became her third top 10 single in the United States. After co-founding Safehouse Records, Lovato released her fifth and sixth studio albums, Confident (2015) and Tell Me You Love Me (2017), both of which dealt lyrically with more mature themes with the lead single from the latter, "Sorry Not Sorry", becoming Lovato's most commercially successful single in the United States to date. In 2018, she was featured on Clean Bandit's single "Solo", which reached number one in fifteen countries.
Musically, Lovato is considered a pop, pop rock, and R&B artist. She 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, and holds a Guinness World Record. In addition to music and acting, Lovato has become known as an advocate for mental health awareness and other social and environmental causes, having struggled with bipolar disorder, an eating disorder, and addiction; in response to which she has 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.