Bella Hadid flashes her underboob in daring sheer halterneck as she lights up the catwalk with sister Gigi and Kaia Gerber at the Alberta Ferretti fall-winter presentation for Milan Fashion Week

On a night dedicated to high fashion it was sisters Bella and Gigi Hadid who lit up the catwalk as designer Alberta Ferretti unveiled his latest collection at Milan Fashion Week.

Revealing a hint of under-boob in an embellished sheer halterneck dress, Bella, 21, took centre stage as she prepared to walk the runway on behalf of Ferretti, whose latest fall-winter range features a diverse range of sweeping sheer gowns.

Contrasted with a solid black lower half, the outfit proved to be a high-point as the she strode the runway with sister Gigi and Cindy Crawford's model daughter Kaia Gerber.

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Hard to miss: Bella Hadid took centre stage as designer Alberta Ferretti unveiled his latest collection at Milan Fashion Week on Wednesday courtesy of her semi-sheer halterneck dress

Hard to miss: Bella Hadid took centre stage as designer Alberta Ferretti unveiled his latest collection at Milan Fashion Week on Wednesday courtesy of her semi-sheer halterneck dress

Here they come: Bella Hadid, Joan Smalls and Gigi Hadid modelled a diverse range of sweeping embellished gowns as part of the new fall-winter collection from Ferratti
Here they come: Bella Hadid, Kaia Gerber and Gigi Hadid modelled a diverse range of sweeping embellished gowns as part of the new fall-winter collection from Ferratti
Here they come: Bella Hadid, Joan Smalls and Gigi Hadid modelled a diverse range of sweeping embellished gowns as part of the new fall-winter collection from Ferratti

Here they come: (L-R) Bella Hadid, Kaia Gerber and Gigi Hadid modelled a diverse range of sweeping embellished gowns as part of the new fall-winter collection from Ferratti

Exposing her nicely toned arms, Bella was on form during her latest runway appearance in the Italian fashion capital. 

The model later traded her sheer outfit for a highly distinctive printed evening dress with a cinched waist that served to accentuate her slender frame. 

Older sister Gigi, 22, proved to be an equally engaging sight in a an elegant diamond patterned sheer variation that partially exposed her breasts as  they strode the catwalk.

Striking: Contrasted with a solid black lower half, the outfit proved to be a high-point as the she strode the runway

Striking: Contrasted with a solid black lower half, the outfit proved to be a high-point as the she strode the runway

Make way: Joan Smalls also joined by Cindy Crawford's model daughter Kaia Gerber at the Milan fashion event
Make way: Joan Smalls also joined by Cindy Crawford's model daughter Kaia Gerber at the Milan fashion event

Make way: Joan Smalls (L) also joined by Cindy Crawford's model daughter Kaia Gerber (R) at the Milan fashion event 

Stunning: A distinctive semi-sheer detail partially exposed Gigi's breasts during her latest runway appearance 

Stunning: A distinctive semi-sheer detail partially exposed Gigi's breasts during her latest runway appearance 

The American model also opted for a comparatively demure black sweater with pinched shoulders, teamed with high-slung purple print trousers. 

Elsewhere Kaia, 16, showed off her model credentials in a series of creations from the designer, amongst them a distinctively tasseled winter jacket. 

A simple black T-shirt and matching trousers added to the look, while a glittering gold belt gave it an extravagant flourish.  

Changing things up: The American model also opted for a comparatively demure black sweater with pinched shoulders, teamed with high-slung purple print trousers

Changing things up: The American model also opted for a comparatively demure black sweater with pinched shoulders, teamed with high-slung purple print trousers

Models on the move: Gigi and Bella were on form as they showcased Ferratti's latest distinctive collection
Models on the move: Gigi and Bella were on form as they showcased Ferratti's latest distinctive collection

Models on the move: Gigi and Bella were on form as they showcased Ferratti's latest distinctive collection 

On display: Bella's striking halterneck fully exposed her nicely toned arms

On display: Bella's striking halterneck fully exposed her nicely toned arms

Step by step: Models walked the runway debuting Ferretti's latest designs on Wednesday evening
Step by step: Models walked the runway debuting Ferretti's latest designs on Wednesday evening

Step by step: Models walked the runway debuting Ferretti's latest designs on Wednesday evening 

Engaging: Gigi and Kaia led the line in front of an arresting stage display 

Engaging: Gigi and Kaia led the line in front of an arresting stage display 

Not to be outdone, American star Joan Smalls ensured she claimed her own share of the spotlight. 

The model commanded attention as she strode the catwalk in a patterned mini-dress and thick black tights, teamed with ankle boots.  

The stars joined a host of models at the show  as Ferretti's latest line was unveiled.  

Upbeat: Gigi shared a laugh with fellow model Yasmin Wijnaldum backstage at the event on Wednesday 

Upbeat: Gigi shared a laugh with fellow model Yasmin Wijnaldum backstage at the event on Wednesday 

Say cheese: Bella joined her sister for a series of intimate backstage portraits
Say cheese: Bella joined her sister for a series of intimate backstage portraits

Say cheese: Bella joined her sister for a series of intimate backstage portraits

Lovely: Bella's features were accentuated with deft touches of make-up 

Lovely: Bella's features were accentuated with deft touches of make-up 

Strike a pose: Kaia sported a distinctive trouser suit as she she took her turn alongside Gigi backstage at the event
Strike a pose: Kaia sported a distinctive trouser suit as she she took her turn alongside Gigi backstage at the event

Strike a pose: Kaia sported a distinctive trouser suit as she she took her turn alongside Gigi backstage at the event 

In good company: Cindy's daughter was accompanied by another model as they posed for a series of glossy portraits 

In good company: Cindy's daughter was accompanied by another model as they posed for a series of glossy portraits 

Bella, who used to be a competitive equestrian show-jumper, recently invested in a farm, in Pennsylvania, with her sister Gigi and their mother Yolanda.

The bolthole, near New York City, served as a family retreat where the women can relax and ride horses together.

'Riding is the best thing Gigi and I do together,' Bella told the latest issue of Vogue. 'We get up in the morning and feed the animals—it's a fully operational place!'

Meanwhile, Gigi discussed her well being and career as well as life balance in an interview with the glossy magazine.

'It’s important to always be ready, and when you come to work being inspired by things outside the fashion industry, it makes the work better,' she explained.  

Make way: Kaia ensured she stood out as she strode the catwalk on Wednesday 

Make way: Kaia ensured she stood out as she strode the catwalk on Wednesday 

High spirits: The young model was in a jovial mood following her latest runway appearance
High spirits: The young model was in a jovial mood following her latest runway appearance

High spirits: The young model was in a jovial mood following her latest runway appearance 

Incoming: Joan claimed her own share of the spotlight in a bold patterned minidress 

Incoming: Joan claimed her own share of the spotlight in a bold patterned minidress 

Say cheese: Gigi and Bella posed for selfies with fans outside the event on Wednesday afternoon 

Say cheese: Gigi and Bella posed for selfies with fans outside the event on Wednesday afternoon 

Good times: The pair were in high spirits as they made their way inside 

Good times: The pair were in high spirits as they made their way inside 

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