Demetria Devonne "Demi" Lovato (born August 20, 1992) is an American singer-songwriter, musician, and actress. Her earliest roles included Angela on Barney & Friends, before she became better known for her starring roles in the Camp Rock movies, as Sonny Munroe in the Disney sitcom Sonny with a Chance, and as the star of the 2009 movie Princess Protection Program. She is also involved in philanthropic activities through charity work and various social and environmental causes.

As a solo musical artist, Lovato released her debut album Don't Forget on September 23, 2008. The album debuted at number two on the Billboard 200 selling 89,000 copies in the first week. It has since shipped over 500,000 copies, earning a gold certification in the United States. Lovato released her second album, Here We Go Again, on July 21, 2009. The album debuted at number one on the Billboard 200, selling 108,000 copies in the first week. Her third studio album, Unbroken, was released on September 20, 2011 and peaked at number four on the Billboard 200. She is working on her fourth studio album.

Thomas William "Tom" Hiddleston (born 9 February 1981) is an English film, television, radio, and stage actor. He trained at the Royal Academy of Dramatic Art (RADA), and he rose to prominence through a number of TV roles and more recently major film roles. He played Loki in the 2011 Marvel Studios film Thor, Captain Nicholls in Steven Spielberg's World War I film War Horse (2011), and also Freddie Page in the British drama The Deep Blue Sea, alongside Rachel Weisz. He played author F. Scott Fitzgerald in the Woody Allen film Midnight in Paris (2011). He returned to his role as Loki in The Avengers (2012) and is set to reprise the character again for Thor 2 (2013).

Hiddleston was born in Westminster, London, to parents Diana Patricia (née Servaes), a former stage manager and arts administrator, and James Norman Hiddleston, a scientist in physical chemistry who was the managing director of a pharmaceutical company. His father is from Greenock, Scotland and his mother from Suffolk, England. He is the middle child with two sisters, Sarah (oldest), a journalist in India, and Emma (youngest), is also an actor. He was raised in Wimbledon, in his early years, and later in Oxford. When Hiddleston was 13, he boarded at Eton College, at the same time that his parents were going through a divorce. "I think I started acting because I found being away at school while my parents were divorcing really distressing." He went on to act at The Dragon School in Oxford, then continued on to the University of Cambridge, where he earned a double first. He graduated from the Royal Academy of Dramatic Art in 2005.