went underwear-free just last week when the 57-year-old made a dazzling appearance at New York's - but she's been banned from repeating the stunt at Cannes. The Never Let Go actress, also famous for her role in the 2004 classic Catwoman, was told in no uncertain terms that her dress must not breach "decency" rules on the red carpet.
The new guidelines at the famed French film festival also rule out large bouffant dresses which could obstruct others' freedom of movement on the crowded carpet. The official charter confirms: "Voluminous outfits, in particular those with a large train, that hinder the proper flow of traffic of guests and complicate seating in the theater are not permitted." It continues that staff will be "obligated to prohibit red carpet access to anyone not respecting these rules".

Speaking at the festival's press conference, Halle confirmed: "'I had an amazing dress by Gupta to wear tonight, and I cannot wear it because the train is too big.
"Of course, I'm going to follow the rules, so I had to make a pivot. But the nudity part, I do think, is probably also a good move."
In previous years, models including Kendall Jenner and at the festival, while more recently at the Grammys, Kanye West's wife Bianca Censori gave the room a full-frontal view of her nude body in just a see-through dress.
Festival organisers have different plans for celebrities, however, and have recommended women don items like a "little black dress [or] cocktail dress" with "elegant shoes and sandals".
They've also confirmed a ban on "tote-bags, backpacks or large bags" - although festival chief Thierry Fremaux seems to have given up on his original plan to ban selfies from the carpet.
A decade ago, he hit out at the selfie culture, branding it "ridiculous and grotesque", and insisted organisers would have to "slow down the process on the steps".
Meanwhile, Halle hit the red carpet in a comparatively demure-looking floor-length dress with black and white stripes - a dramatic departure from her braless and pantless outfit at the Met Gala.
She is to join the likes of Juliette Binoche on the jury, and says her three-decade career in film will give her a "unique perspective" on what she sees.
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