Actress Emma Watson (L) and Actors Rupert Grint (2nd L) and Daniel Radcliffe (3rd L) look on as Author J K Rowling (2nd R) speaks at the world premiere of "Harry Potter and the Deathly Hallows - Part 2" in Trafalgar Square, in central London, July 7, 2011.[Photo/Agencies]

(L-R) Author J K Rowling, Actress Emma Watson, Producer David Heyman and Actor Daniel Radcliffe, listen to Actor Rupert Grint speak at the world premiere of "Harry Potter and the Deathly Hallows - Part 2" in Trafalgar Square, in central London, July 7, 2011.[Photo/Agencies]