Shots from the The Duchess premiere

Another night, another premiere. But what film is Keira Knightley promoting this time? Is it Atonement ... Pirates of the Caribbean ... Domino? You'd think there'd be some clue around here somewhere ... Photograph: Matt Dunham/AP

You know it's party time when Ralph Fiennes hits the carpet. The actor otherwise known as "the Duke" positively explodes with mirth and good humour. The very sight of him is enough to raise a chuckle. Photograph: Chris Jackson/Getty

And look, here's Dominic Cooper, the duchess's smooth-talking love interest. For the record, Cooper plays a Whig. He is not actually wearing one. Photograph: Daniel Deme/EPA

Make way for Camilla Rutherford. What's she doing here? Rutherford is the one-time face of Max Factor (wonder how Max Factor felt about that), and appeared oh-so-briefly in The Darjeeling Ltd. She does not act in The Duchess. Photograph: Zak Hussein/PA

Anna Popplewell isn't actually in The Duchess either. But she does play Susan in the Narnia movies. This, clearly, was enough to secure her an invite. Photograph: Dave M Benett/Getty

Flashbulb explosion! It's Amanda Foreman, who wrote the book that was later made into the film (the very film) that is playing here tonight. Creepy coincidence, huh? Photograph: Matt Dunham/AP

First rule of the the celebrity premiere: if you can't get Ozzie Osborne, get George. No, the shadow chancellor does not appear in The Duchess. But he is 'heir to the Osborne Baronetcy', which means he will one day be a baron. And that's more than Ralph Fiennes can say. Photograph: Dave M Benett/Getty

Cue Tara Palmer-Tompkinson, that last-minute arrival. The critics are already tipping her for an Oscar thanks to her heart-rending performance as Keira's soulful chambermaid. Actually that's a lie. Tara isn't in The Duchess either. Photograph: Dave Hogan/Getty