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From left, actors Daniel Radcliffe, Emma Watson and Rupert Grint attend the premiere of "Harry Potter and the Half Blood Prince", in New York, on Thursday, July 9, 2009. (AP Photo/Peter Kramer)

Actress Marcia Gay Harden attends the premiere of "Harry Potter and the Half-Blood Prince" at the Ziegfeld Theater, Thursday, July 9, 2009 in New York. (AP Photo/Evan Agostini)

Actress Emma Watson attends the premiere of "Harry Potter and the Half-Blood Prince" at the Ziegfeld Theater, Thursday, July 9, 2009 in New York. (AP Photo/Evan Agostini)

Actor Tom Felton and girlfriend Jade Olivia attend the premiere of "Harry Potter and the Half-Blood Prince" at the Ziegfeld Theater on Thursday, July 9, 2009 in New York City. (AP Photo/Evan Agostini)

Actor Rupert Grint attends the premiere of "Harry Potter and the Half-Blood Prince" at the Ziegfeld Theater, Thursday, July 9, 2009 in New York. (AP Photo/Evan Agostini)

Actress Vanessa Williams attends the premiere of "Harry Potter and the Half Blood Prince", in New York, on Thursday, July 9, 2009. (AP Photo/Peter Kramer)

Actor Tom Felton and girlfriend Jade Olivia attend the premiere of "Harry Potter and the Half-Blood Prince" at the Ziegfeld Theater on July 9, 2009 in New York City. (AP Photo/Evan Agostini)

Actress Emma Watson attends the premiere of "Harry Potter and the Half-Blood Prince" at the Ziegfeld Theater, Thursday, July 9, 2009 in New York. (AP Photo/Evan Agostini)

Actor Daniel Radcliffe attends the premiere of "Harry Potter and the Half Blood Prince", in New York, on Thursday, July 9, 2009. (AP Photo/Peter Kramer)

Actor Rupert Grint attends the premiere of "Harry Potter and the Half Blood Prince", in New York, on Thursday, July 9, 2009. (AP Photo/Peter Kramer)

Actor Alan Rickman attends the premiere of "Harry Potter and the Half Blood Prince", in New York, on Thursday, July 9, 2009. (AP Photo/Peter Kramer)

In this photo released by CBS, Daniel Radcliffe, left, star of "Harry Potter and the Half Blood Prince," talks about his acting career with host David Letterman on the set of the "Late Show with David Letterman," Thursday, July 9, 2009. Radcliffe starred as Harry Potter in all five films. (AP Photo/CBS, John Paul Filo)

Actor Tom Felton attends the premiere of "Harry Potter and the Half-Blood Prince" at the Ziegfeld Theater, Thursday, July 9, 2009 in New York. (AP Photo/Evan Agostini)

Singer - actress Vanessa Williams, left, and daughter Jillian attend the premiere of "Harry Potter and the Half-Blood Prince" at the Ziegfeld Theater, Thursday, July 9, 2009 in New York. (AP Photo/Evan Agostini)

Actress Vanessa Williams attends the premiere of "Harry Potter and the Half Blood Prince", in New York, on Thursday, July 9, 2009. (AP Photo/Peter Kramer)

Singer Ashanti attends the premiere of "Harry Potter and the Half Blood Prince", in New York, on Thursday, July 9, 2009. (AP Photo/Peter Kramer)

Actor Daniel Radcliffe attends the premiere of "Harry Potter and the Half-Blood Prince" at the Ziegfeld Theater, Thursday, July 9, 2009 in New York. (AP Photo/Evan Agostini)

Actor Kelsey Grammer and wife Camille Grammer attend the premiere of "Harry Potter and the Half Blood Prince", in New York, on Thursday, July 9, 2009. (AP Photo/Peter Kramer)

Actress Michelle Trachtenberg attends the premiere of "Harry Potter and the Half Blood Prince", in New York, on Thursday, July 9, 2009. (AP Photo/Peter Kramer)

Singer Ashanti attends the premiere of "Harry Potter and the Half-Blood Prince" at the Ziegfeld Theater, Thursday, July 9, 2009 in New York. (AP Photo/Evan Agostini)

Actor Rupert Grint attends the premiere of "Harry Potter and the Half-Blood Prince" at the Ziegfeld Theater, Thursday, July 9, 2009 in New York. (AP Photo/Evan Agostini)

Actor Daniel Radcliffe attends the premiere of "Harry Potter and the Half-Blood Prince" at the Ziegfeld Theater on Thursday, July 9, 2009 in New York City. (AP Photo/Evan Agostini)

Actress Emma Watson attends the premiere of "Harry Potter and the Half Blood Prince", in New York, on Thursday, July 9, 2009. (AP Photo/Peter Kramer)

Actor Daniel Radcliffe attends the premiere of "Harry Potter and the Half-Blood Prince" at the Ziegfeld Theater, Thursday, July 9, 2009 in New York. (AP Photo/Evan Agostini)

In this photo released by CBS, British actress Emma Watson talks with host David Letterman in New York, Wednesday, July 8, 2009, about the premier of "Harry Potter and the Half Blood Prince," on the set of the "Late Show with David Letterman." Watson plays Hermione Granger in the film. (AP Photo/CBS, John Paul Filo)

Actress Michelle Trachtenberg attends the premiere of "Harry Potter and the Half Blood Prince", in New York, on Thursday, July 9, 2009. (AP Photo/Peter Kramer)

Actor Daniel Radcliffe attends the premiere of "Harry Potter and the Half Blood Prince", in New York, on Thursday, July 9, 2009. (AP Photo/Peter Kramer)

Actor Tom Felton attends the premiere of "Harry Potter and the Half-Blood Prince" at the Ziegfeld Theater, Thursday, July 9, 2009 in New York. (AP Photo/Evan Agostini)

Singer Ashanti attends the premiere of "Harry Potter and the Half Blood Prince", in New York, on Thursday, July 9, 2009. (AP Photo/Peter Kramer)

Actor Rupert Grint attends the premiere of "Harry Potter and the Half Blood Prince", in New York, on Thursday, July 9, 2009. (AP Photo/Peter Kramer)

From left, actors Daniel Radcliffe, Emma Watson and Rupert Grint attend the premiere of "Harry Potter and the Half Blood Prince", in New York, on Thursday, July 9, 2009. (AP Photo/Peter Kramer)

Actress Emma Watson attends the premiere of "Harry Potter and the Half Blood Prince", in New York, on Thursday, July 9, 2009. (AP Photo/Peter Kramer)

Actors Daniel Radcliffe and Emma Watson attend the premiere of "Harry Potter and the Half Blood Prince", in New York, on Thursday, July 9, 2009. (AP Photo/Peter Kramer)

Actor Daniel Radcliffe attends the premiere of "Harry Potter and the Half Blood Prince", in New York, on Thursday, July 9, 2009. (AP Photo/Peter Kramer)

Actor Tom Felton attends the premiere of "Harry Potter and the Half Blood Prince", in New York, on Thursday, July 9, 2009. (AP Photo/Peter Kramer)

From left, actors Michael Gambon, Daniel Radcliffe, Emma Watson, Rupert Grint and Alan Rickman attend the premiere of "Harry Potter and the Half Blood Prince", in New York, on Thursday, July 9, 2009. (AP Photo/Peter Kramer)