Emma said: "Every time I come to a premiere I see more and more fans. It gets bigger and bigger," while Daniel said this film is the one he is most "proud" of.
HOW HARRY POTTER HAS AGED
Daniel Radcliffe was chosen to play Harry Potter in The Philosopher’s Stone when he was just 10 years old.
By the time the Chamber of Secrets was released, Radcliffe, 13, had grown used to the limelight.
Radcliffe was 15 when The Prisoner of Azkaban came out. Questions were asked about whether he was too old.
Following the Goblet of Fire, Radcliffe, then 16, signed up to play Potter in the remaining three films.
Radcliffe, who next appears in The Order of the Phoenix, is now 17 and has branched out into theatre.
The Order of the Phoenix is the fifth in the series of Harry Potter films, and hits cinemas in the UK on 11 July, 10 days before the final Potter book.
The Order of the Phoenix has already had its world premiere, in Tokyo, Japan, on 28 June.
It's a big month for Potter fans, with the film, final book and the 10th anniversary of the first book being published all taking place.