Rupert Grint - who plays Ron Weasley, Daniel Radcliffe - who plays Harry Potter, and Emma Watson - who plays Hermione Grainger, arrives for the Premiere of "Harry Potter and the Philosopher's Stone" at the Odeon Leicester Square, November 4, 2001.

Actors from "Harry Potter and the Chamber of Secrets" (L-R) Emma Watson, Daniel Radcliffe and Rupert Grint pose for photographs at a news conference in London, October 25, 2002.

Actors Emma Watson (L), Daniel Radcliffe (C) and Rupert Grint arrive at the U.S. premiere of 'Harry Potter and the Chamber of Secrets,' at the Ziegfeld Theatre in New York, November 10, 2002.

Stars of the Harry Potter films (L-R) Daniel Radcliffe who plays Harry, Emma Watson who plays Hermione Granger and Rupert Grint who plays Ron Weasley, pose for photographers in London, May 27, 2004. The film adaptation of the Harry Potter books by Britain's J K Rowling, Harry Potter and The Prisoner Of Azkaban, was due to premiere in the U.K. on May 30.

British actors Rupert Grint (L) who plays Ron, Emma Watson (C) who plays Hermione, and Daniel Radcliffe (R) who plays Harry Potter in the film "Harry Potter and the Goblet of Fire" attend a photocall in London October 25, 2005.

Actors Daniel Radcliffe (L) and Rupert Grint and actress Emma Watson (C) pose at the premiere of the film "Harry Potter and The Goblet of Fire" in New York November 12, 2005.

Actors Daniel Radcliffe (R), Rupert Grint (L), and Emma Watson pose during a photocall to promote the film "Harry Potter and the Order of the Phoenix" at County Hall in London June 25, 2007.

Cast members Daniel Radcliffe (C), Rupert Grint (L) and Emma Watson from the movie "Harry Potter and the Order of the Phoenix" leave their hand prints in cement at the Chinese theatre in Hollywood, California, July 9, 2007.

British actors Rupert Grint (L-R), Emma Watson and Daniel Radcliffe arrive for the world premiere of "Harry Potter and the Half Blood Prince" at Leicester Square in London July 7, 2009.

Actors (L-R) Michael Gambon, Bonnie Wright, Daniel Radcliffe, Emma Watson, Rupert Grint, Tom Felton and Warwick Davies (bottom) arrive for the premiere of "Harry Potter and the Half-Blood Prince" in New York July 9, 2009.

Britain's Emma Watson poses with Daniel Radcliffe (L) and Rupert Grint as they arrive for the world premiere of "Harry Potter and the Deathly Hallows: Part 1" at Leicester Square in London November 11, 2010.

Actors (L-R) Daniel Radcliffe, Emma Watson, Rupert Grint and Tom Felton pose at the premiere of "Harry Potter and the Deathly Hallows: Part 1" in New York November 15, 2010.

Harry Potter actors attend a photocall outside of St Pancras Station and hotel in central London July 6, 2011. In the picture is (Front row, L-R) Evanna Lynch, Rupert Grint, Emma Watson, Tom Felton, Bonnie Wright, (Back row) James Phelps, Oliver Phelps, Domhall Gleeson (2nd R) and Matthew Lewis (R).

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, July 7, 2011.

Producer David Heyman hugs actress Emma Watson (2nd L), as author J K Rowling (L) and actor Daniel Radcliffe watch, during speeches at the world premiere of "Harry Potter and the Deathly Hallows - Part 2" in Trafalgar Square in central London July 7, 2011.