Emma Watson, Rupert Grint and Daniel Radcliffe - 2000

(Photo by Dave Hogan/Getty Images)

Emma Watson, Daniel Radcliffe, Rupert Grint - 2000

(Courtesy of Warner Bros./Newsmakers)

Actor Rupert Grint - 2000

(Photo by Dave Hogan/Getty Images)

Actress Emma Watson - 2000

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Actor Daniel Radcliffe - 2000

(Photo by Dave Hogan/Getty Images)

Actor Rupert Grint - 2001

(Photo by Anthony Harvey/Getty Images)

Actors Rupert Grint, Daniel Radcliffe and Emma Watson and Author JK Rowling - 2002

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Rupert Grint, Emma Watson, and Daniele Radcliffe - 2004

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MTV TRL With Daniel Radcliffe And Emma Watson - 2004

(Photo by Scott Gries/Getty Images)

MTV TRL With Daniel Radcliffe And Emma Watson

NEW YORK - MAY 24: (U.S. TABS OUT) Actors Emma Watson and Daniel Radcliffe pose backstage during MTV's Total Request Live at the MTV Times Square Studios May 21, 2004 in New York City. The two are stars of the movie Harry Potter And The Prisoner Of Azkaban. (Photo by Scott Gries/Getty Images)

Daniel Radcliffe, Emma Watson and Rupert Grint - 2004

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Rupert Grint, Emma Watson and Daniel Radcliffe - 2004

(Photo by Dave Hogan/Getty Images)

Daniel Radcliffe, J. K. Rowling, Rupert Grint and Emma Watson - 2004

(Photo by Dave Hogan/Getty Images)

Rupert Grint and Daniel Radcliffe - 2004

(Photo by Dave Hogan/Getty Images)

UK: Harry Potter And The Prisoner Of Azkaban - Premiere

LONDON - MAY 30: (UK TABLOID NEWSPAPERS OUT) Actor Daniel Radcliffe attends the UK Premiere of "Harry Potter And The Prisoner Of Azkaban" at the Odeon Leicester Square on May 30, 2004 in London. The film is the third celluloid instalment of J K Rowling's series of books. (Photo by Dave Hogan/Getty Images)

Rupert Grint, Emma Watson and Daniel Radcliffe - 2005

(Photo by Dave Hogan/Getty Images)

Rupert Grint, Emma Watson and Daniel Radcliffe - 2005

(Photo by Dave Hogan/Getty Images)

Daniel Radcliffe, Emma Watson and Rupert Grint - 2005

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Warner Bros. Pictures Premiere Of "Harry Potter & The Goblet Of Fire"

NEW YORK - NOVEMBER 12: (U.S. TABLOIDS AND HOLLYWOOD REPORTER OUT) (L-R) Actors Emma Watson, Daniel Radcliffe and Katie Leung attend the premiere of "Harry Potter and the Goblet of Fire" on November 12, 2005 in New York City. (Photo by Peter Kramer/Getty Images)

Emma Watson, Daniel Radcliffe, Rupert Grint - 2006

(Photo by Dave Hogan/Getty Images)

Awards Room At Sony Ericsson Empire Film Awards

LONDON - MARCH 13: Emma Watson, Daniel Radcliffe and Rupert Grint pose with The Empire Outstanding Contribution Award for The Harry Potter Films during the Sony Ericsson Empire Film Awards 2006 at the Hilton London Metropole on March 13, 2006 in London, England. (Photo by MJ Kim/Getty Images)

Rupert Grint, Emma Watson, Daniel Radcliffe and Katie Leung - 2007

(Photo by Dave Hogan/Getty Images)

Daniel Radcliffe, Emma Watson and Rupert Grint - 2007

(Photo by Dave Hogan/Getty Images)

Daniel Radcliffe, Emma Watson and Rupert Grint - 2007

(Photo by Alberto E. Rodriguez/Getty Images)

Rupert Grint, actor Daniel Radcliffe and actress Emma Watson - 2007

(Photo by Alberto E. Rodriguez/Getty Images)

Rupert Grint, Emma Watson and Daniel Radcliffe - 2007

(Photo by Chris Jackson/Getty Images)

Rupert Grint, Emma Watson and Daniel Radcliffe - 2009

(Photo by Tim Whitby/Getty Images)

Rupert Grint, J K Rowling, Emma Watson and Daniel Radcliffe - 2009

(Photo by Dave Hogan/Getty Images)

Daniel Radcliffe, Emma Watson, Rupert Grint and Tom Felton - 2009

(Photo by Stephen Lovekin/Getty Images)

Bonnie Wright, Daniel Radcliffe and Emma Watson - 2010

(Photo by Dave Hogan/Getty Images)

Rupert Grint, Emma Watson and Daniel Radcliffe - 2010

(Photo by Dave Hogan/Getty Images)

Daniel Radcliffe, Emma Watson, J K Rowling and Rupert Grint - 2010

(Photo by Dave Hogan/Getty Images)

Daniel Radcliffe; Emma Watson and Rupert Grint - 2010

(Photo by Stephen Lovekin/Getty Images)