Alessandra Ambrosio opts to go braless in perilously plunging gown with dramatic thigh-slash at amfAR Gala

She has graced the red carpet with a series of racy looks throughout The 69th Annual Cannes Film Festival. 

Yet Alessandra Ambrosio appears to have reached a crescendo with her wildly sexy ensembles as she paraded into Thursday night's amfAR Gala at the Hotel du Cap-Eden-Roc.

The 35-year-old Brazilian beauty proved just why she is one of the world's top models as she went braless in an extremely sexy black gown for the glitzy bash.

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Smoking hot: Alessandra Ambrosio appears to have reached a crescendo with her wildly sexy ensembles as she paraded into Thursday night's amfAR Gala at the Hotel du Cap-Eden-Roc

While Alessandra went totally underwear free in a futuristic silver gown at the Unknown Girl premiere just one night before, this time it was all about her classic beauty and flawless frame.

Taking the term little black dress to new realms of scanty, the stunning star slipped into the dramatically low cut gown with a super-high thigh split. 

Going braless, she showed off her extremely ample assets through the deeply plunging neckline, while also flashing her legs thanks to the sky-high slash. 

The plunging neckline tickled her waist in its depth while the halter neckline emphasised her slender and toned arms and incredibly perky assets. 

Hello there! The 35-year-old Brazilian beauty proved just why she is one of the world's top models as she went braless in an extremely sexy black gown for the glitzy bash

Legs eleven: While Alessandra went totally underwear free in a futuristic silver gown at the Unknown Girl premiere just one night before, this time it was all about her classic beauty and flawless frame

She sported a pair of black high-waisted knickers to help protect her modesty, yet they acted to shield very little in comparison to the rest of the gown. 

Adding height to her already statuesque frame, the Victoria's Secret angel slipped into simple strappy heels with a delicate ankle strap. 

She accessorised with a host of exquisite Boucheron diamonds, which dazzled on her neck with a coordinating ring adding to the ensemble and a matching wrist cuff.  

Her tresses were styled into a sexy bed head style with delicate curls worked into the shoulder length tresses. 

Sensational stunner: Taking the term little black dress to new realms of scanty, the stunning star slipped into the dramatically low cut gown with a super-high thigh split

Sky-high: Adding height to her already statuesque frame, the Victoria's Secret angel slipped into simple strappy heels with a delicate ankle strap

Dazzling: She further upped the sex appeal of the ensemble with a smudgy black eyeliner paired with a smouldering taupe lip

She further upped the sex appeal of the ensemble with a smudgy black eyeliner paired with a smouldering taupe lip. 

The fundraiser, which raises money for AIDs research, will see the likes of Katy Perry perform for the A-list crowd, while Adriana Lima will co-chair the event. 

After posing up a storm on the red carpet, the celebrities make their way into a lavish dinner which is followed by a no expense spared auction, with last year's event raising a staggering $30 million.

 The event, which takes place just outside of Cannes, will also feature Kirsten Dunst, Vanessa Paradis and Donald Sutherland who are serving as chairs for the Cannes Film Festival Jury.

Enchanting: All eyes were on her as she posed up a storm on the red carpet, dripping in Boucheron diamonds 

Kisses! Ana Beatriz Barros and Alessandra cosied up to blow kisses for the camera 

Leggy ladies! The pair showed off their tanned and toned pins in the sultry ensembles 

Fashionable friends: Alesandra joined fashion designer Kenneth Cole and her former Victoria's Secret colleague Heidi Klum

Legs eleven: The pair had certainly gone for similar styles with plunging necklines and thigh-high splits

Strike a pose: Alessandra poses for a selfie with Kenneth

Helping hand: Alessandra relied on her fashionable pal Kenneth to help her across the grass in her heels

Time to take a selfie! Alessandra made sure to capture the moment with a selfie as she spent time with Kenneth Cole

What a line-up! Alessandra made sure her perfect pin stood out as she posed with Petra and Heidi

Model behaviour: Alessandra later changed into a silver ensemble as she joined her fellow models and Uma Thurman on stage

Strutting her stuff: She looked divine and leggy in the thigh-grazing metallic mini for her stint on the catwalk