The 20-year-old was still chatting at 4.15am as organisers from the Weinstein studio and Momentum Films were desperate to go home.
The actress, who has played Hermione Granger in the Harry Potter films for half of her life — the last of which, The Deathly Hallows: Part 2, is released in July — has star quality in spades. She has a grace and style that’s rare.
Soon she will go before the cameras to film The Perks Of Being A Wallflower opposite Logan Lerman, while autumn will see the release of Simon Curtis’s film My Week With Marilyn, in which she has a small role opposite Michelle Williams and Eddie Redmayne.