Slender beauty: The 33-year-old wasn't at all fazed by the lenses pointing at her, as she proudly showed off her trim figure encased in the stunning scarlet red dress
Effortless beauty: Natalie may have been in the industry for over 20 years, but she looked more youthful than ever with a smokey eye and little else on her face while she posed with her husband on the red carpet
Movie star twosome: Natalie and Ben met on the set of her 2010 movie The Black Swan - which saw her win the Best Actress Oscar - as he worked on the movie as the lead choreographer
Owning it: Despite their equally-dramatic gowns, Naomi and Julianne let each other have their moment to shine
Hollywood comes to France: Every year, the biggest stars on the globe descend on this small but lavish town in the French Riviera - for a week and a half every May, Cannes is the centre of the showbiz universe
The bodice of the youthful 46-year-old's silver-grey dress was, like Julianne's, incredibly low-cut, revealing a subtle and tasteful amount of her cleavage.
And also like Julianne's ensemble, it was glistening with a smattering of gorgeous embellishments, glittering in the nightfall on the French Riviera town.
However, it was the full feather-covered skirt - with added pockets for nonchalance - that really added to the drama of the Australian actress' incredible red carpet look.
As she turned to all angles to face the hundreds of photographers on the prestigious red carpet, the star revealed her dress to be backless.
One for the photo album? Natalie and Ben showed they have their couple posing style nailed as they soaked up the atmosphere while working the cameras
The 33-year-old - who walked the red carpet with her husband, choreographer Benjamin Millepied -wore her mid-length brunette tresses in the sleekest of styles, slicked back in a glossy 'do, lightly curling up at the ends.
And Sienna Miller followed suit in a primary colour dress: the member of the Cannes jury rocked the perfect black tie attire in a midnight blue one-shouldered gown.
With a style similar to Naomi's, the 33-year-old British actress wore her blonde mane in a pushed-back style with a lift at the roots, but added a dash of colour with a scarlet red lipstick.
Blue-tiful: Member of the jury for 2015 Sienna Miller graced the red carpet in a midnight blue gown, which sat close to her svelte curves and was finished with an asymmetric shoulder
Great from all angles: Thanks to the 360-degree nature of the red carpet, Sienna was able to show off her figure-hugging frock from the back as well as the front as she hugged her co-jurors
Stunning display: The jurors lined up for several great shots as they walked the red carpet at the debut movie premiere and opening ceremony, working an overall dark colour palette... apart from singer/songwriter Rokia Traore (fourth from right) in her scarlet red gown
Getting ready for the role: Sienna looked on as she was flanked by Ethan Coen (left) and Xavier Dolan, ahead of their 11-day stint as jurors - they'll have to decide on the winner of the coveted Palme d'Or prize on 24 May
Telling a joke? Jake appeared to assume the role of jury joker as he pulled a face while chatting to jury President Joel Coen, as Sienna looked on in interest
Close pals: Sienna looked to have made an impression on her fellow jurors Jake Gyllenhaal (left) and French-Canadian actor and director Xavier Dolan (right) as they posed for the cameras
The esteemed members of the jury: Sienna Miller (centre) wowed in a midnight blue gown as she joined her fellow Cannes jurors at the first premiere of the festival
She joined her fellow members of the jury as they made their way up the iconic red carpet at the steps of the iconic Cannes landmark, all of them giggling and clearly enjoying a rapport that will no doubt intensify as the days and judging wear on.
Looking particularly dapper was Sienna's fellow judge Jake Gyllenhaal, working a black tuxedo.
The two appear to have struck up quite the rapport: as well as giggling away at the official juror's photo call on Wednesday afternoon, they showed off their friendship status at the opening ceremony too, chatting away among the others.
A venue to put the others to shame: The Grand Theatre Lumiere at the Palais des Festivals is perhaps the most iconic cinema ever, and houses the top movie premieres during the Cannes Film Festival year after year
Lining up to get the winning shot: Cannes draws in hundreds of photographers from around the world year after year, each of them clamoring to get the best photos
Walk of fame: The female guests certainly put on an impressive show with their extraordinary and colourful gowns - socialite Hofit Golan (front) led the way in her vintage-inspired number
Also taking to the red carpet were the other jurors: Sophie Marceau, Xavier Dolan, Rokia Traore and Mexican director Guillermo del Toro, as well as jury presidents Ethan and Joel Coen.
This year Julianne is at the star-studded event in her role as a L'Oreal Paris ambassador with the beauty no doubt top of the guest list for the week's best parties.
And, on Wednesday night during the opening ceremony, she was given the prestigious Best Actress award for her role in Maps To The Stars, a prize she was revealed as the winner at last year's ceremony.
Winner! For the second year in a row, Julianne Moore was awarded the Best Actress prize during the Cannes opening ceremony, picking up her prize from last year's Maps To The Stars
Up on stage: The opening ceremony saw the jurors take centre stage as they welcomed the Hollywood elite to the festival
Showstopper: Earlier in the day, Sienna had kept it chic and classy in a Balenciaga gown at the juror's photo call, but she upped up the elegance for the evening event in her slinky gown
This follows her slew of awards season success this year, for her role as an Alzheimer's sufferer in Still Alice: she won an Oscar, a Golden Globe and a BAFTA among many others.
The Oscar winner can next be seen in Freeheld, playing a police lieutenant who is diagnosed with cancer. Ellen Page portrays her lover in the film, due out in October.
She's also also reprising her role as President Alma Coin in The Hunger Games: Mockingjay - Part Two, which will be released in November.
Green goddess: Lupita Nyong'o made an incredible statement as she arrived on the red carpet in her mint coloured Gucci gown
Whoosh: The skirt section was pleated and made up of diaphanous fabric, which flew in the air as the 32-year-old actress made her way inside the venue
Details, darling! The Oscar winner's hair was worn up and secured in place with a couple of diamond encrusted alice bands which were set against very elegant diamond drop earrings
Hollywood's finest: Lupita is still riding high on her wave of fame after winning the Best Actress Oscar in 2014 for her role in 12 Years A Slave
Meanwhile Naomi's latest film Sea Of Trees is competing for the coveted Palme d’Or top prize at the 68th annual festival. The film from Gus Van Sant also stars Matthew McConaughey and Ken Watanabe with the tale of survival shot in Massachusetts and Japan.
The A-list were out in force for the premiere of La Tete Haute on Wednesday - the movie centres on a young delinquent as he comes of age.
Starring Catherine Deneuve and Benoît Magimel the film is slated for release on Thursday after it's showing at Cannes.
It was an incredibly fashionable evening, even for Cannes, which is renowned for its prominence in the fashion arena, rivalling the likes of events such as the Met Gala and the Oscars.
They've got it! Doutzen looked ravishing in a body-skimming white gown, while model Liya Kebede showed off her legs in a little metallic number
Proving her model prowess: Beautiful 22-year-old Victoria's Secret star Karlie oozed sex appeal with almost her full legs on show in a very racy, high thigh-split dress in shimmering silver and white
A true star: Karlie may not be an actress but she sure has her red carpet posing style down-pat, working the cameras into a frenzy as she posed this way and that, her legs on display as well as her perfect pout
She's in fashion: Doutzen, 30, showed off her enviable svelte frame in her figure-hugging white gown, her shapely derriere acting as the main event
Three's a crowd: Doutzen was joined by her handsome and incredibly suave husband DJ Sunnery James, and they were also inadvertently accompanied by accidental photobomber, model Liya Kebede (left)
Esteemed guest: The beautiful 29-year-old model attended the opening ceremony on the arm of De Grisogono president and founder Fawaz Gruosi