It's the night the 'in' crowd get all dolled up and strut their stuff. Monday night's annual Met Ball is a bit like the Oscars of the fashion world - think high fashion, drama and one amazing celebrity-filled guest list.
But it appears not everyone is happy with the dress code for this year's ball, a fundraising gala for the benefit of the Metropolitan Museum of Art's Costume Institute.
Designer Marc Jacobs told Vogue that the theme - which is a tribute to couturier Charles James - wasn't "as exciting" as previous years and that it is "much more straightforward".
Jacobs said the theme is "not as exciting as wearing a lace dress and boxer shorts". The little ensemble he is referring to is what he wore to the gala back in 2012 for the 'Schiaparelli and Prada: Impossible Conversations' theme.
And this year he won't be pushing any boundaries (or so he says) when he escorts actress Jessica Lange to the event. Jacobs added: "I think it will be black with white tie, as the dress code asks for. I'll be wearing Saint Laurent."
Other themes in the past have included 'Superheroes: Fashion and Fantasy'; 'Costumes of Royal India'; 'Dangerous Liaisons: Fashion and Furniture in the 18th Century'; and 'Punk Chaos to Couture', which was last years.
We can't wait to see this year's looks. Surely the 'Beyond Fashion' exhibition is going to mean bigger and better dresses than ever before.
Let's have a look at some of the craziest outfits we've seen on the Met Ball red carpet....