Lovato began her acting career at the age of seven on the children's television series Barney & Friends as Angela, appearing in seasons seven and eight alongside long time friend Selena Gomez.
In 2006 Lovato guest starred on Prison Break as Danielle Curtin in the episode "First Down". She also appeared in the second season of the television sitcom Just Jordan as Nicole, in the episode "Slippery When Wet". In January 2007, she landed the role of Charlotte Adams on the Disney Channel Original Short Series, As the Bell Rings, which premiered on August 26, 2007. A few of her original songs, including "Shadow," were featured on the show. Upon leaving the show, her character was replaced by Lindsey Black. Lovato sang a cover of "That's How You Know" from the film Enchanted. The ...view middle of the document...
In June 2009 Lovato co-starred in Princess Protection Program as Princess Rosalinda alongside Selena Gomez on Disney Channel. The TV movie is about a young Princess who is taken into custody by the Princess Protection Program and is whisked away to rural Louisiana where she must learn the ins and outs of behaving like a normal American teenager. The movie is the fourth highest rated Disney Channel Original Movie, and premiered on Disney Channel with 8.5 million viewers.
Next, Lovato went on to star in the Disney Channel Original Series, Sonny With a Chance, which premiered on February 8, 2009. The series' second season premiered on March 14, 2010. The show stars Lovato as Sonny who becomes the new cast member of a live comedy show, So Random!.
In September 2009, production began for Camp Rock 2: The Final Jam. The Disney Channel Original Movie premiered on September 3, 2010. The movie also gained 8 million viewers on its premiere.
In March 2010, Lovato was one of the many stars featured in a PSA for Voto Latino in order to promote the organization's "Be Counted" campaign for the 2010 U.S. Census. Lovato guest appeared in an episode of the medical drama series Grey's Anatomy as a teenage patient. The episode titled "Shiny Happy People" aired May 13, 2010 on the ABC television network. In a review of the episode, EW.com praised her performance stating, "I still believe that even an unbiased observer would conclude that the Disney princess did a fine job acting it up as a suicidal 16-year-old who was admitted after trying to claw her own eyes out".
Demi Lovato made a surprise appearance on America's Next Top Model on the September 15 episode to speak out about bullying. Lovato also appeared on CNN on September 7, to speak out about bullying.