Rock Mafia has worked with an American singer, songwriter, and actress who made her debut as a child actress in what show?
Rock Mafia:  They have worked with artists such as: Demi Lovato, Diplo, Zedd, Gwen Stefani , Quavo, Yung Thug, Tiesto, Miley Cyrus, Selena Gomez, No Doubt, Wyclef Jean, Green Day, Mariah Carey, Justin Bieber, Flo Rida, Ellie Goulding, Tokio Hotel, Bebe Rexha and Armin van Buuren. Demi Lovato: Demetria Devonne Lovato, known professionally as Demi Lovato ( or ; born August 20, 1992), is an American singer, songwriter, and actress. Demi Lovato:  After making her debut as a child actress in "Barney & Friends", Lovato rose to prominence in 2008 when she starred in the Disney Channel television film "Camp Rock" and released her debut single "This Is Me" which peaked at number nine on the "Billboard" Hot 100.
i don't know