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 appearing on the television series Barney & Friends, and received her breakthrough role starring as Mitchie Torres in the Disney Channel television film Camp Rock (2008), and its sequel Camp Rock 2: The Final Jam (2010). The former film's soundtrack included Lovato's debut single, "This Is Me", which peaked in the top ten of the Billboard Hot 100; later that year, she signed with Hollywood Records.
Since then, 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 released six top 20 singles on the Billboard Hot 100 with "Here We Go Again", "Skyscraper", "Give Your Heart a Break", "Heart Attack", "Cool for the Summer", and "Sorry Not Sorry". Lovato has also achieved commercial success with several collaborations, including "No Promises" with Cheat Codes, "Échame la Culpa" with Luis Fonsi, and "Solo" with Clean Bandit. She served as a judge and mentor on the U.S. version of The X Factor in its second and third seasons, and, along with Nick Jonas, co-founded Safehouse Records in 2015.
Of her further acting credits, Lovato starred in the lead role of the Disney Channel television series Sonny with a Chance (2009–2011), and appeared in the channel's television film Princess Protection Program (2009). She also played a recurring role on the musical television series Glee. Lovato's struggles with bipolar disorder, addiction, and several other personal issues received significant media attention in the 2010s, in response to which she released two documentaries, Demi Lovato: Stay Strong (2012) and Demi Lovato: Simply Complicated (2017), and published the book Staying Strong: 365 Days A Year (2013).
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, and a Latin American Music Award. She also holds a Guinness World Record. Outside the entertainment industry, Lovato has participated in activism for several social causes since the launch of her career. 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.