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Image: Rupert Grint, Emma Watson, Daniel Radcliffe
Ian West  /  AP
Rupert Grint, left, Emma Watson, center, and Daniel Radcliffe attend a photocall at the premiere of “Harry Potter and the Half-Blood Prince” in London.
updated 7/7/2009 10:34:36 AM ET 2009-07-07T14:34:36

The new Harry Potter film has its world premiere in London on Tuesday, ending a two-year wait for faithful fans who have been counting down the days before its theatrical release on July 15.

"Harry Potter and the Half-Blood Prince" was originally scheduled to be shown in 2008, and followers of the boy wizard and his adventures at Hogwarts school were disappointed when Hollywood studio Warner Bros. decided to push it back.

Two years ago the fifth movie and the seventh and final book in British author J.K. Rowling's bestselling series combined to trigger an unprecedented wave of "Pottermania" around the world.

That film, "Harry Potter and the Order of the Phoenix," earned an impressive $938 million in international ticket sales, making it the second biggest picture of 2007.

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And the final book, "Harry Potter and the Deathly Hallows" was the fastest-selling book on record, underlining the popular appeal and commercial value of Rowling's tales.

At the “Half-Blood Prince” premiere on Tuesday, the young stars are expected to greet hundreds of fans in central London.

They are also set to wear white ribbons as a tribute to Rob Knox, who performed in “Half-Blood Prince” before he was murdered in May, 2008, in a knife attack on southeast England.

"I won't pretend that I knew Rob incredibly well, or that I was one of his best friends on set, but I knew him, I liked him, and what happened to him was obviously tragic and awful," said Daniel Radcliffe, who plays Harry Potter.

Love in the air
In “Half-Blood Prince,” the sixth Potter story, Hogwarts school is increasingly vulnerable to attack from the evil Lord Voldemort, wizard Potter's nemesis.

Professor Slughorn, played by Jim Broadbent, joins the cast, and Hogwarts headmaster Albus Dumbledore places more and more trust in Potter, determined to prepare him for his inevitable showdown with Voldemort.

Meanwhile, love blossoms, with Harry falling for Ginny and Ron attracting the attention of Lavender Brown as a heartbroken Hermione looks on jealously.

The first five films have earned $4.5 billion at the box office, and Rowling's Potter books have sold an estimated 400 million copies worldwide.

There will be eight films in all, with the final volume divided into two. The seventh film is scheduled to hit cinemas in November, 2010 and the eighth in the summer of 2011.

Emma Watson, who plays Hermione, believes the Potter world will live on long after the final movie.

"We'll all miss it," she told reporters at a press conference this week to publicize “Half-Blood Prince.”

"But also ... I think you underestimate the longevity of the books and the series. I don't think it's going anywhere fast. I think new generations of children will keep reading the books and hopefully watching the films."

Copyright 2012 Thomson Reuters. Click for restrictions.

Photos: Hollywood's youth movement

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  1. Howl at the 'Moon'

    Taylor Lautner is best-known as Jacob Black in the "Twilight" series of films. Thanks to a newly buff bod in "New Moon," the accomplished martial artist should lure more fans to "Team Jacob" from co-star Robert Pattinson's "Team Edward." (Stuart Wilson / Getty Images) Back to slideshow navigation
  2. Swift rise to fame

    Taylor Swift was just 16 when she released her debut single, "Tim McGraw," which went to No. 6 on the Billboard country charts. It's been a meteoric rise ever since. According to Nielsen SoundScan, she was the biggest-selling American artist of 2008. (Mark J. Terrill / AP) Back to slideshow navigation
  3. Zac attack

    Zac Efron earned fame after his role in the first "High School Musical" movie, but he was also a regular cast member on the TV series "Summerland" and played snooty Link Larkin in the movie version of the musical "Hairspray." His relationship with co-star Vanessa Hudgens means he's often in the tabloids and celebrity magazines. (Phil Mccarten / Reuters) Back to slideshow navigation
  4. All in the family

    Emma Roberts may resemble a few older actors you know. Her dad is Eric Roberts and her aunt is megastar Julia. Emma has been acting since she was 9, with her most famous roles including that of Nancy Drew in the 2007 movie, the lead role in the TV series "Unfabulous," and a starring role in "Hotel for Dogs." (Chris Pizzello / AP) Back to slideshow navigation
  5. Showtime for Shia

    Shia LaBeouf had been acting for years when Steven Spielberg cast him in "Disturbia," "Transformers" and as the son of Indiana Jones and Marion Ravenwood in "Indiana Jones and the Kingdom of the Crystal Skull." His unusual first name is Hebrew for "gift from God," and his last name is believed to be a French corruption of a word meaning either "the ox" or "the beef." (Michael Buckner / Getty Images) Back to slideshow navigation
  6. Bella, Bella

    Kristen Stewart is the envy of many young girls for her role as Bella Swan, opposite heartthrob Robert Pattinson in the "Twilight" movies. You may also recognize Stewart for her role as Jodie Foster's diabetic daughter who had to hide out with mom in their mansion's "Panic Room." (Carlos Alvarez / Getty Images) Back to slideshow navigation
  7. 'The Amanda Show' continues

    When you have a show with your name in the title and you're only 13, there's nowhere to go but up. After "The Amanda Show" stopped airing in 2002, Amanda Bynes moved on to films. She's starred in "What a Girl Wants" and "She's the Man," among other ventures. She's won numerous Kid's Choice Awards. (Jason Merritt / Getty Images) Back to slideshow navigation
  8. Miley mania

    Television, films, music, books -- there isn't an entertainment medium where Miley Cyrus has yet to make her mark. The 16-year-old daughter of country singer Billy Ray Cyrus became a sensation with the Disney Channel series "Hannah Montana" and her recording and acting career has landed her on Forbes' list of the top-earning celebrities. (Ethan Miller / Getty Images) Back to slideshow navigation
  9. Putting the 'Half' in 'Two and a Half Men'

    Angus T. Jones plays Jake Harper, the son of Jon Cryer's character and the nephew of Charlie Sheen's character on the popular CBS sitcom, "Two and a Half Men." He's also made numerous movie appearances, and was named one of the world's richest teens by People magazine. (Kevin Winter / Getty Images for PCA) Back to slideshow navigation
  10. Moving on from 'Lizzie McGuire'

    Hilary Duff came to fame playing Lizzie McGuire in the Disney Channel series of the same name. But she also has a musical career: Three Duff albums have been certified platinum, with her first studio album, "Metamorphosis," going triple platinum. (Louie Traub / AP) Back to slideshow navigation
  11. Making magic

    Daniel Radcliffe won the much-coveted movie role of Harry Potter, the boy wizard from J.K. Rowling's beloved children's book series. The London-born actor played the role from age 12 on up, taking young Harry through Hogwarts school and all the books. He also drew attention for his nude scene in the play "Equus." (Dave Hogan / Getty Images) Back to slideshow navigation
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    Raven-Symone played Denise Huxtable's stepdaughter, Olivia Kendall, on the 1980s megahit "The Cosby Show." The actress, whose full name is Raven-Symone Christina Pearman, went on to a variety of other roles, including the starring part on the Disney Channel's "That's So Raven." (Mark Mainz / Getty Images) Back to slideshow navigation
  13. Save the cheerleader, save the world

    Hayden Panettiere has been acting since childhood, with roles on soap operas and in "Remember the Titans" among her most famous. But she garnered her most media attention playing superpowered cheerleader Claire Bennet on NBC's "Heroes." (Matt Sayles / AP) Back to slideshow navigation
  14. Growing up Barney

    Selena Gomez began her acting career with a recurring role on "Barney & Friends." She moved on to some minor TV and movie roles and then took on the role of Hannah Montana's rival, Mikayla. She also played the lead in the Disney Channel series "Wizards of Waverly Place." She's pals with fellow Disney star Demi Lovato. (Jewel Samad / AFP/Getty Images) Back to slideshow navigation
  15. Violet, you're turning violet

    AnnaSophia Robb has had a variety of roles in her 15 years. She played Violet Beauregarde, the bratty little gum-chewing girl in the Tim Burton-directed "Charlie and the Chocolate Factory." She also starred in "Bridge to Terabithia" and "Race to Witch Mountain." (Alberto E. Rodriguez / Getty Images) Back to slideshow navigation
  16. Canadian import

    Ellen Page was born and raised in Canada, gaining fame for a role in the Canadian comedy "Trailer Park Boys." But U.S. audiences really got to know her when she took the starring role as a witty pregnant teen in "Juno." She was nominated for the best-actress Oscar for that role, but lost to Marion Cotillard, star of the Edith Piaf biopic, "La Vie En Rose." (Kevin Winter / Getty Images) Back to slideshow navigation
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    Modern-day vampires sure don't look like Bela Lugosi. Robert Pattinson plays Edward Cullen, the vampire hunk at the heart of the "Twilight" films, based on Stephenie Meyer's enormously popular book series. London-born Pattinson also played Cedric Diggory in two Harry Potter movies. (Kevin Winter / Getty Images) Back to slideshow navigation
  18. 'Suite Life' indeed

    Ashley Tisdale first came to audiences' attention playing Maddie Fitzpatrick in "The Suite Life of Zack and Cody," but went on to play Sharpay Evans, the female villain in the "High School Musical" movie series. She's also a singer, and her debut album went gold in 2007. (Pascal Le Segretain / Getty Images) Back to slideshow navigation
  19. Little Miss Sunshine

    Abigail Breslin has had a number of major roles for a girl who was only born in 1996. She starred as a misfit beauty pageant contestant in "Little Miss Sunshine," and has also appeared in "Nim's Island" (with former child star Jodie Foster) and "Kit Kittredge: An American Girl." (Peter Kramer / AP) Back to slideshow navigation
  20. 'High School' sweetheart

    Vanessa Hudgens plays Gabriella Montez, the female lead in the "High School Musical" film series, playing beside real-life boyfriend Zac Efron. She is also a singer, and her first album was certified gold in 2006. (Jason Merritt / Getty Images) Back to slideshow navigation
  21. Disney's Demi

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  22. Dakota the media darling

    Dakota Fanning was just seven when she stared in "I Am Sam." Since then, her films have included "Charlotte's Web," "War of the Worlds," "Man on Fire," and "The Secret Life of Bees." Controversy has surrounded her role in 2006's "Hounddog," in which her character is raped. "It's called acting," Fanning told Reuters. (Chris Pizzello / AP) Back to slideshow navigation
  23. Brotherly love

    The Jonas brothers, from left, Kevin, Joe and Nick, have harnessed tween success thanks to the Disney Channel and three pop albums: "It's About Time," "Jonas Brothers," and "A Little Bit Longer." The group was nominated for Best New Artist at the 51st Grammy Awards and won an American Music Award for Breathrough Artist. (Dan Steinberg / AP) Back to slideshow navigation
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