'Harry Potter' final film: World Premiere

British actress Emma Watson sheds a tear alongside actor Daniel Radcliffe, after they arrive in Trafalgar Square, in central London, for the World Premiere of 'Harry Potter and The Deathly Hallows: Part 2', the last film in the Harry Potter series on July 7, 2011. (AP/Joel Ryan)

Producer David Heyman watches as actress Emma Watson (C) reacts while author JK Rowling applauds during a speech at the world premiere of 'Harry Potter and the Deathly Hallows - Part 2' in Trafalgar Square, in central London, on July 7, 2011. (Reuters/Dylan Martinez)

Producer David Heyman hugs actress Emma Watson during speeches at the world premiere of 'Harry Potter and the Deathly Hallows - Part 2' in Trafalgar Square in London. (Reuters/Dylan Martinez)

From left, Daniel Radcliffe, Emma Watson and Rupert Grint at Trafalgar Square in central London, for the World Premiere of 'Harry Potter and the Deathly Hallows: Part 2'. Thousands of fans from around the world gathered in London for the premiere of the final film of the magical adventure series. (AP/Joel Ryan)

Producer David Heyman watches actress Emma Watson (2nd L) wipes a tears away as author JK Rowling (L) and actor Daniel Radcliffe look on during the world premiere of 'Harry Potter and the Deathly Hallows - Part 2' in Trafalgar Square, in central London. (Reuters/Dylan Martinez)

Emma Watson (C) arrives at the world premiere of Harry Potter and the Deathly Hallows - Part 2 in London. (AFP/Carl Court)

British author JK Rowling (2nd left)with actors Daniel Radcliffe, Emma Watson and Rupert Grint in Trafalgar Square, central London, for the World Premiere of 'Harry Potter and the Deathly Hallows: Part 2' the last film in the series, on July 7, 2011. (AP/Joel Ryan)

Emma Watson and Daniel Radcliffe pose together during the world premiere of 'Harry Potter and the Deathly Hallows: Part 2' at Trafalgar Square in London. (Reuters/Dylan Martinez)

Actress Emma Watson (C) attends the world premiere of Harry Potter and the Deathly Hallows - Part 2 in central London on July 7, 2011. (AFP/Carl Court)

Harry Potter author JK Rowling attends the world premiere of 'Harry Potter and the Deathly Hallows - Part 2' in central London on July 7, 2011. (AFP/Carl Court)

This four-photo combo highlights some of the signs brandished by fans before the World Premiere of movie 'Harry Potter and The Deathly Hallows: Part 2', the last film in the Harry Potter series. (AP/)

Actress Emma Watson (C) poses with fellow cast members Daniel Radcliffe and Rupert Grint (L) as they arrive for the world premiere of 'Harry Potter and the Deathly Hallows: Part 2' at Trafalgar Square in London. (Reuters/Dylan Martinez)

Actress Emma Watson waves at the world premiere of 'Harry Potter and the Deathly Hallows: Part 2' at Trafalgar Square in London July 7, 2011. (Reuters/Dylan Martinez)

British presenter Jonathan Ross and Jane Goldman arrive for the after show party for 'Harry Potter and The Deathly Hallows: Part 2' in London. (AP/Jonathan Short)

British actor Tom Felton and Jade Gordon arrive for the after show party for 'Harry Potter and The Deathly Hallows: Part 2' on July 7, 2011 in London. (AP/Jonathan Short)

Actor Rupert Grint arrives for the after show party for 'Harry Potter and The Deathly Hallows: Part 2' in London. (AP/Jonathan Short)

US actress Emma Roberts arrives for the after show party for 'Harry Potter and The Deathly Hallows: Part 2' on July 7, 2011 in London. (AP/Jonathan Short)

British actress Bonnie Wright arrives for the after show party for 'Harry Potter and The Deathly Hallows: Part 2' in London. (AP/Jonathan Short)

British actress Emma Watson arrives at the world premiere of Harry Potter and the Deathly Hallows - Part 2 in central London on July 7, 2011. (AFP/Carl Court)

Pixie Geldof arrives for the after show party for 'Harry Potter and The Deathly Hallows: Part 2' in London. (AP/Jonathan Short)

Irish actress Evanna Lynch arrives for the after show party for 'Harry Potter and The Deathly Hallows: Part 2' in London. (AP/Jonathan Short)

British actress Helena Bonham Carter arrives for the after show party for 'Harry Potter and The Deathly Hallows: Part 2'. (AP/Jonathan Short)

British singer Eliza Doolittle arrives for the after show party for 'Harry Potter and The Deathly Hallows: Part 2' in London. (AP/Jonathan Short)

Emma Watson arrives for the after show party for 'Harry Potter and The Deathly Hallows: Part 2' in London on July 7, 2011. (AP/Jonathan Short)

Actress Helen McCrory and actor Damian Lewis arrive at the world premiere of 'Harry Potter and the Deathly Hallows - Part 2' in Trafalgar Square on July 7, 2011. (Reuters/Dylan Martinez)