It looks like Anna Wintour's assistant forgot to tell the world there was going to be an extravagant, star-studded red-carpet event in London this week.

Because apparently it's taking place now – and it's called Vogue World.

On Thursday local time, Vogue hosted its second annual Vogue World event. Last year, it took place in New York City, while this year it's in London – kicking off London Fashion Week with a swanky event at Theatre Royal Drury Lane.

US and UK editors Anna Wintour and Edward Enninful are hosting the event, while Stormzy, FKA twigs, Sienna Miller (?) and James McAvoy (??) are among those performing.

And while many of us weren't even told the event was happening, it looks like the celebs weren't told the dress code, either.

Sienna Miller

Nicola Coughlan

Jodie Turner-Smith

Anna Wintour, Edward Enninful and Baz Luhrmann

Kate Winslet

Jared Leto and Shannon Leto

Cole Sprouse

Poppy Delevingne, Stella McCartney and Carey Mulligan

Princess Eugenie

Princess Beatrice and Edoardo Mapelli Mozzi

Winnie Harlow

Georgia May Jagger

Simone Ashley

Maude Apatow

Emilia Clarke

Maisie Williams

Twiggy

Dove Cameron

Alexa Chung

Nathalie Emmanuel

Charlotte Tilbury

Daisy Edgar-Jones

Rita Ora

Gemma Chan

Feature image: Getty.