Hundreds of screaming Potter fans queued outside the studios in Leavesden, near Watford in Herts, where all the multimillion pound-grossing films based on JK Rowling's magical stories were shot.
Local boy Grint, who played Ron Weasley, said: "This is the most glamorous I've ever seen Watford."
More top news
Oxfordshire Safeguarding Children's Board has apologised over the time it took to investigate child exploitation in the county.
The working group that is supporting fan ownership of Leeds has confirmed they will try and meet with Oscar-winning actor Russell Crowe
Newly released audio recording of Mohamed Emwazi, aka "Jihadi John", reveals his claims that he was threatened by MI5 five years ago.