20 of the most daring outfits ever worn at the annual Cannes amfAR Gala

The names written in crystals on her Randolph Duke dress were actually celebrity autographs from stars like Tom Cruise and Clint Eastwood, and the matching jewels on her arm spelled "amfAR."

As for the gown itself, it was black and sleeveless with a round back cutout that extended to her sides.

Her red gown was crafted entirely from the see-through material and was split at the neckline to create a keyhole cutout that reached her stomach.

There were also three strips of red satin with floral appliqués that wrapped around her chest, hips, and waist.

Givenchy designed the structural, single-strap look, which had a fitted bodice and a full, ruffled skirt.

Portman wore it with black sandals, crystal earrings, and a tight updo hairstyle.

The sleeveless garment was made from a mix of netted fabric, lace, and string, the latter of which swirled across her décolletage.

And its sheer skirt — which was full, pleated, and decorated with stripes — revealed the black lingerie with garters she wore underneath.

The dress was originally designed as part of Jean Paul Gaultier's calligraphy-inspired collection that year.

Her purple gown wrapped around her body and perfectly matched her vibrant eye makeup.

But the model's accessories really stole the show. She wore black sandals, carried a red-and-black cape, donned mesh gloves, and wore a mask with horns over her face.

Its single-strap bodice was tan and decorated with a white paisley print, creating the illusion that she was naked aside from the swirled design.

The garment also had a floor-length, flowing skirt with a thigh-high slit that made the outfit even more daring.

Emilio Pucci designed her halter dress, which had a deep slit in the middle of its bodice and a matching one at the bottom of its long skirt.

And when Jackson turned around, you could see that the gown was also backless and scooped above her backside.

Her white, sleeveless gown designed by Roberto Cavalli had both a plunging, V-shaped neckline and waist cutouts lined with sparkles.

But the daring details didn't stop there. The gown also featured a thigh-high slit in its pleated, floor-length skirt.

Her white, long-sleeved gown stood out thanks to its rectangle cutout that extended the length of its bodice, and the thigh-high slit in its column skirt.

She wore it with tan sandals and neutral makeup.

The off-the-shoulder Marchesa design was lined with red lace and embellished with fabric flowers along its neckline and long sleeves.

Petals were also scattered across its bodice and skirt, leading to another patch of appliqués around the hemline.

The Ralph & Russo couture gown left little to the imagination, as it was entirely sheer and covered in crystals.

It featured a corset bodice, asymmetrical straps, and a long skirt with a train and thigh-high slit.

Her white gown was strapless with an opaque bustier top and a see-through column skirt.

She wore it with matching underwear, diamond hoop earrings, and a bob hairstyle.

Her silver, sleeveless gown was cut deeply across its bodice and skirt to reveal the model's sides and legs.

She wore it with strappy sandals, a silver bangle bracelet, dangling earrings, and a sleek updo.

The dress had sharp shoulder pads and a plunging neckline up top, while fringe lined its skirt at the bottom.

And that's not to mention the laser-cut designs across the gown that revealed the model's skin.

Designed by Etro, her blue gown was seemingly crafted from a single piece of fabric that draped across her body to create twists and cutouts.

The chiffon material was also painted with gold polka dots that added shine to her look.

Valdrin Sahiti designed her white gown, which had strings of pearls in place of a top and bedazzled sheer fabric acting as a skirt and cape.

Her sheer Dundas look was embellished with sporadic silver stripes and round cutouts that extended from her waist to her thighs.

Gaurav Gupta designed her stunning two-piece set. It comprised a bedazzled bralette with a single shoulder strap and a floor-length skirt that dipped low in the back.

Rowland wore the outfit with a delicate diamond necklace.

Heidi sported a salmon-colored gown that was basically one giant ruffle wrapped around her body. It extended into a train behind her and was accessorized with dramatic earrings.

Leni, on the other hand, wore a black gown made from a netted material that showed her skin. The dress also featured rose-shaped embellishments across the chest and waist, and the 20-year-old model completed her look with a diamond necklace.

She wore a golden creation from Yanina that included a see-through mesh gown embellished with metallic sparkles, and a feather-covered veil draped over her head.