Potter 3 started shooting in February.
Old faves - including Daniel Radcliffe as Harry and Robbie Coltrane as Hagrid - have been joined by loads of new stars, including Gary Oldman as Sirius Black.
There have already been a few hiccups with the shoot. A fire in the Highlands halted filming and then some of the crew threatened to go on strike.
But everything's been sorted out now and Hagrid's hideaway will soon take shape.