JK Rowling, the creator of Harry Potter, will join cast members Daniel Radcliffe, Ron Weasley and Hermione Granger at today's European premiere of the new Harry Potter film in London's Leicester Square.
'Harry Potter and the Order of the Phoenix' is the fifth film in the series about the young boy wizard, played by Radcliffe, who attends the magical school of Hogwarts.
Grint and Watson take, once again, the roles of his friends Ron Weasley and Hermione Granger.
The world premiere took place in Tokyo last week.
Rowling's seventh and last Harry Potter book, 'Harry Potter and the Deathly Hallows', is due to be released on 21 July.
According to Amazon.com nearly 1.6m people worldwide have already pre-ordered the book.
