Harry Potter And The Half-Blood Prince World Premiere at the Harry Potter And The Half-Blood Prince at London England. (Footage by WireImage Video/GettyImages)

Atmosphere arrival Jim Broadbent, Emma Watson, Rupert Grint, Jessie Cave, David Barron at the Harry Potter and the Half-Blood Prince Press Conferences at London England. (Footage by WireImage Video/GettyImages)

Atmosphere departure Jim Broadbent, Emma Watson, Rupert Grint, Jessie Cave, David Barron at the Harry Potter and the Half-Blood Prince Press Conferences at London England. (Footage by WireImage Video/GettyImages)

INTERVIEW Jim Broadbent on joining the Harry Potter film world at the Harry Potter and the Half-Blood Prince Press Conferences at London England. (Footage by WireImage Video/GettyImages)

INTERVIEW Jim Broadbent on acting with Tom Felton again, and on what inspiration he drew from for his role as Professor Slughorn at the Harry Potter and the Half-Blood Prince Press Conferences at London England. (Footage by WireImage...

INTERVIEW David Barron on whether an audience has to have seen the previous films to understand Harry Potter and the Half-Blood Prince at the Harry Potter and the Half-Blood Prince Press Conferences at London England. (Footage by...

INTERVIEW Emma Watson on hitting people in the movies and INTERVIEW Rupert Grint on being hit a lot at the Harry Potter and the Half-Blood Prince Press Conferences at London England. (Footage by WireImage Video/GettyImages)

Atmosphere at the Harry Potter And The Half-Blood Prince at London England. (Footage by WireImage Video/GettyImages)

Atmosphere at the Harry Potter And The Half-Blood Prince at London England. (Footage by WireImage Video/GettyImages)

Atmosphere at the Harry Potter And The Half-Blood Prince at London England. (Footage by WireImage Video/GettyImages)

INTERVIEW Rupert Grint on kissing Emma Watson in the film at the Harry Potter And The Half-Blood Prince at London England. (Footage by WireImage Video/GettyImages)

INTERVIEW Daniel Radcliffe on not seeing Twilight which stars his ex co-star Robert Pattinson at the Harry Potter and the Half-Blood Prince Press Conferences at London England. (Footage by WireImage Video/GettyImages)

ATMOSPHERE at the 'Harry Potter And The Half Blood Prince' Premiere at New York NY. (Footage by WireImage Video/GettyImages)

INTERVIEW: Daniel Radcliffe on how he feels to be here tonight, being overwhelmed by the success of the Harry Potter franchise. at the 'Harry Potter And The Half Blood Prince' Premiere at New York NY. (Footage by WireImage...

INTERVIEW Daniel Radcliffe and Tom Felton on the funniest moment in the past ten years, on how awful doing Quidditch is, on Michael Gambon being the least professional actor ever at the Harry Potter and the Half-Blood Prince Press...

INTERVIEW David Yates on the darkness of the series as it progresses and INTERVIEW David Heyman on the rating of the movie and that children aren't as worried as adults of the darkness at the Harry Potter and the Half-Blood Prince Press...

Emma Watson at the Harry Potter And The Half-Blood Prince at London England. (Footage by WireImage Video/GettyImages)

INTERVIEW David Yates on what he'll do after the final Harry Potter movie at the Harry Potter and the Half-Blood Prince Press Conferences at London England. (Footage by WireImage Video/GettyImages)

INTERVIEW David Yates and David Heyman on whether they tinkered with the film because of its delay at the Harry Potter and the Half-Blood Prince Press Conferences at London England. (Footage by WireImage Video/GettyImages)

INTERVIEW Michael Gambon and David Heyman on what they'll do after Harry Potter at the Harry Potter and the Half-Blood Prince Press Conferences at London England. (Footage by WireImage Video/GettyImages)

Daniel Radcliffe at the 'Harry Potter And The Half Blood Prince' Premiere at New York NY. (Footage by WireImage Video/GettyImages)

INTERVIEW David Yates on how pivotal this movie is for the whole Harry Potter series and why it's so pivotal for Michael Gambon and INTERVIEW David Heyman on Dumbledore passing his knowledge onto Harry Potter at the Harry Potter and the...

Michael Gambon and Tom Felton at the Harry Potter and the Half-Blood Prince Press Conferences at London England. (Footage by WireImage Video/GettyImages)

INTERVIEW Daniel Radcliffe on doing another kissing scene and whether it was any easier - it wasn't - he grew up with Bonnie since she was 9 at the Harry Potter and the Half-Blood Prince Press Conferences at London England. (Footage by...