Gallery: An emotional Potter farewell

British author JK Rowling, second left, joins actors, left to right, 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. Photo: AP

British author JK Rowling, second left, joins actors, left to right, 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. Photo: AP

British actor Rupert Grint arrives in Trafalgar Square, in central London, for the World Premiere of Harry Potter and The Deathly Hallows: Part 2, the last film in the series. Photo: AP

Actors Oliver (L) and James Phelps arrive for the world premiere of "Harry Potter and the Deathly Hallows - Part 2" in Trafalgar Square, in central London. Photo: Reuters

Actor Rupert Grint, who plays Ron Weasley, poses for pictures in front of fans as he arrives for the world premiere of "Harry Potter and the Deathly Hallows - Part 2" in Trafalgar Square, in central London. Photo: Reuters

Actress Emma Watson arrives for the world premiere of "Harry Potter and the Deathly Hallows - Part 2" in Trafalgar Square, in central London. Photo: Reuters

Producer David Heyman watches as Actress Emma Watson (C) reacts while Author J K Rowling applauds during speeches at the world premiere of "Harry Potter and the Deathly Hallows - Part 2" in Trafalgar Square, in central London. Photo: Reuters

Actress Helena Bonham Carter arrives for the world premiere of "Harry Potter and the Deathly Hallows - Part 2" in Trafalgar Square, in central London. Photo: Reuters

Actress Emma Watson (L) reacts as she poses with fellow cast member Daniel Radcliffe at the world premiere of "Harry Potter and the Deathly Hallows: Part 2" at Trafalgar Square in London. Photo: Reuters

Actor Michael Gambon arrives at the world premiere of "Harry Potter and the Deathly Hallows - Part 2" in Trafalgar Square, in central London. Photo: Reuters

Fans wait for stars to arrive for the world premiere of "Harry Potter and the Deathly Hallows - Part 2" in Trafalgar Square, in central London. Photo: Reuters

Actor Jason Isaacs arrives for the world premiere of "Harry Potter and the Deathly Hallows - Part 2" in Trafalgar Square, in central London. Photo: Reuters

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 central London. Photo: Reuters

Author J K Rowling arrives at the world premiere of "Harry Potter and the Deathly Hallows - Part 2" in Trafalgar Square, in central London. Photo: Reuters

Harry Potter fans in Trafalgar Square, central London, ahead of the World Premiere of Harry Potter and The Deathly Hallows: Part 2, the last film in the series. Photo: AP

British actor Daniel Radcliffe arrives in Trafalgar Square, central London, for the world premiere of Harry Potter and The Deathly Hallows: Part 2, the last film in the series. Photo: AP

Actress Julie Walters arrives at the world premiere of "Harry Potter and the Deathly Hallows - Part 2" in Trafalgar Square, in central London. Photo: Reuters

Actor Ralph Fiennes arrives for the world premiere of "Harry Potter and the Deathly Hallows - Part 2" in Trafalgar Square, in central London. Photo: Reuters

Producer David Heyman watches actress Emma Watson (2nd L) wipes a tear away as Author J K Rowling (L) and Actor Daniel Radcliffe look on during speeches at the world premiere of "Harry Potter and the Deathly Hallows - Part 2" in Trafalgar Square, in central London. Photo: Reuters

Harry Potter fan Ellie Coote, 15, from Oxford, dressed as Professor Dumbledore clutches a book under an umbrella in the rain outside the cinema in Leicester Square, central London, for the World Premiere of Harry Potter and The Deathly Hallows: Part 2, the last film in the series. Photo: AP

Harry Potter fans in Trafalgar Square, central London, ahead of the World Premiere of Harry Potter and The Deathly Hallows: Part 2, the last film in the series. Photo: AP

Actress Maggie Smith arrives for the world premiere of "Harry Potter and the Deathly Hallows - Part 2" in Trafalgar Square, in central London. Photo: Reuters

Fans wait for stars to arrive for the world premiere of "Harry Potter and the Deathly Hallows - Part 2" in Trafalgar Square, in central London. Photo: Reuters

British actress Emma Watson arrives in Trafalgar Square, in central London, for the World Premiere of "Harry Potter and the Deathly Hallows: Part 2" the last film in the series. Photo: AP

Actor Daniel Radcliffe arrives at the world premiere of "Harry Potter and the Deathly Hallows - Part 2" in Trafalgar Square, in central London. Photo: Reuters

Actress Emma Watson (C) poses with actors Rupert Grint (L) and Daniel Radcliffe (R) at the world premiere of "Harry Potter and the Deathly Hallows - Part 2" in Trafalgar Square, in central London. Photo: Reuters

Actress Emma Watson arrives for the world premiere of "Harry Potter and the Deathly Hallows - Part 2" in Trafalgar Square, in central London. Photo: Reuters

Actress Evanna Lynch arrives at the world premiere of "Harry Potter and the Deathly Hallows - Part 2" in Trafalgar Square, in central London. Photo: Reuters

British actress Emma Watson arrives in Trafalgar Square, in central London, for the World Premiere of "Harry Potter and the Deathly Hallows: Part 2" the last film in the series. Photo: AP

Actress Helen McCrory and an unidentified companion arrive at the world premiere of "Harry Potter and the Deathly Hallows - Part 2" in Trafalgar Square, in central London. Photo: Reuters