on Facebook where fans have a chance to win tickets to the World Premiere of the film in London this November.
The launch of the campaign also includes a special message from Emma Watson (sporting her new hairstyle), who talks about how the contest works.
Full details can be found right here on their Facebook page.
Please note that the contest and campaign are only available for UK and Ireland fans. At this time, we do not know if Warner Brothers US will be launching anything today (but as always, we'll keep you updated).
Harry Potter: It All Ends
Harry Potter cast and crew.
IT ALL ENDS!
J.K. Rowling, Dan Radcliffe, Emma Watson and Rupert Grint Give Emotional Goodbye to 'Potter' Series