Fashion magic at Harry Potter premiere

Channelling Glinda the Good Witch in a tiered Oscar de la Renta ball gown, Watson stood alongside series creator JK Rowling—also wearing de la Renta—and welled up as her co-stars paid tribute to their fans.

‘I don’t think the end of the story happens tonight, because each and every person who will see this film will carry this story with them through the rest of their lives,’ Daniel Radcliffe said.

Other cast members also dressed with a high sense of occasion. Bonnie Wright took a sleek turn in floor-length vintage Miu Miu, while Clemence Poesy kept it light and frothy in a white Nina Ricci mini. Helena Bonham Carter chose a relatively sedate ensemble (matching shoes!), topping her evergreen satin gown with Lennon sunglasses and a dramatic chiffon headpiece.

Watson changed into a short, sparkling Elie Saab couture dress for the after-party at Old Billingsgate Market.