Emma Charlotte Duerre Watson (born 15 April 1990) is an English actress and model who rose to prominence playing Hermione Granger, one of three starring roles in the Harry Potter film series. Watson was cast as Hermione at the age of nine, having previously acted only in school plays. From 2001 to 2010, she starred in seven Harry Potter films alongside Daniel Radcliffe and Rupert Grint; she will return for the final installment: the second part of Harry Potter and the Deathly Hallows. Watson's work on the Harry Potter series has earned her several awards and more than £10 million. She made her modelling debut for Burberry's Autumn/Winter campaign in 2009. In 2007, Watson announced her involvement in two non-Harry Potter productions: the television adaptation of the novel Ballet Shoes and an animated film, The Tale of Despereaux. Ballet Shoes was broadcast on 26 December 2007 to an audience of 5.2 million, and The Tale of Despereaux, based on the novel by Kate DiCamillo, was released in 2008 and grossed over US $70 million in worldwide sales. Source: Wikipedia.

Justin Drew Bieber is a Canadian pop-R&B singer. Bieber was discovered in 2008 by Scooter Braun, who happened to come across Bieber's videos on YouTube and later became his manager. Braun arranged for him to meet with Usher in Atlanta, Georgia, and Bieber was soon signed to Raymond Braun Media Group (RBMG), a joint venture between Braun and Usher, and then to a recording contract with Island Records offered by L.A. Reid. His debut single, "One Time", released worldwide in 2009, charted in the top 30 in over ten countries. His debut release, My World, followed on November 17, 2009, and was eventually certified platinum in the United States. He became the first artist to have seven songs from a debut album chart on the Billboard Hot 100. His first full studio release, My World 2.0, was released on March 23, 2010 and has since received similar success; it debuted at number one and within the top ten of several countries and was certified platinum in the United States. It was preceded by the worldwide top-ten single, "Baby," in January 2010. Source: Wikipedia.