Vanity Fair Oscars party is almost as hotly anticipated as the awards ceremony themselves, with legendary stories of stars desperate to get in, risking embarrassment and getting turned away at the door.
One of the most popular elements to the event is the entrance, which sees all attendees stop and pose in their finest attire.
While the dress code is glamorous, it is not as formal as the awards ceremony, meaning lots more flesh is on display.
But a less strict dress code means more margin for error, and sadly many celebrities got it wrong this year.
Going down the route of flashing the flesh, TV presenter Catt Sadler, 43, and actress Regina Hall, 47, both wore gowns with plenty of cleavage on display.
While Hall’s dress was nearly completely sheer, Sadler’s Stello-designed deep v neck was paired with a very high thigh split.
Another common fashion disaster was the use of metallics. Many women looked more disco ball than disco fever in their shimmering dresses.
Elizabeth Banks, 44, in Ralph & Russo, Olivia Wilde, 33, in Roberto Cavalli, and Kathryn Hahn, 44, all attempted to sport the silver metallic look with varying degrees of success.
Playing it safe can be boring, but trying something too fashion forward is more likely to end in disaster.
Such was the case for Rashida Jones, 42, who wore an unflattering silk print Valentino dress which did not suit the A List surroundings.
Angela Bassett, 59, looked striking in a geometric print trouser suit, but the multi colours coupled with the busy print hurt the eyes.
Sarah Paulson, 43, plumped for a more classic gown in a pretty lemon yellow, but ruined the outfit with a pair of black velvet gloves.
The Vanity Fair party was not the only place to witness crimes against fashion tonight, with the Oscars red carpet worst dressed seeing plenty of terrible outfits.
A List actress Salma Hayek, 51, chose a bizarre lilac sequin ruffled gown which made her look like a cross between a glitterball and a loo roll cover.
Salma paired her Gucci dress with severe makeup, which did her no favours, and a tied-back updo.
Taraji P.Henson left little to the imagination in her dress, which was slashed to the thigh and slashed at the bust, as well as being made from a sheer material.