The stunning niece of the late Princess Diana has stepped out in a rather revealing gown for a luxurious event in Italy.

Well, revealing as far as (nearly) royals go.

Lady Kitty Spencer, who is the spokesmodel for the Italian luxury jewellery designer BVLGARI, attended the brand's perfume launch in the picturesque Lake Como, wearing a sheer pink Dolce and Gabbana dress.

The gorgeous tulle gown with sheer detailing featured pink roses and white and pink petals, as Lady Kitty styled her hair in a tight bun and finished her look with jewels.

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She captioned several of the photos with "La Vie en Rose" which is French for "to see with rose coloured glasses".

Lady Kitty recently made headlines after becoming more public with her millionaire fashion tycoon boyfriend โ€” who is 32 years her senior โ€” following rumours the pair began dating last year.

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La Vie en Rose ๐Ÿ’—

A post shared by Kitty Spencer (@kitty.spencer) on

View this post on Instagram

La Vie en Rose ๐Ÿ’—

A post shared by Kitty Spencer (@kitty.spencer) on

Michael Lewis, 60, who is the owner of the high-end Whistles fashion chain, and Lady Kitty have never commented on their romantic relationship, despite reports claiming they began dating in August last year.

The gorgeous blonde broke up with her property tycoon boyfriend, Niccolรฒ Barattieri di San Pietro, 47, in 2017 after four years together.

Lady Kitty, who visited Australia earlier this year and posted a photo of herself in Sydney to her Instagram page, is the daughter of Diana's brother, Earl Spencer.

She has a degree in psychology, politics and English literature from the University of Cape Town, where she grew up.

Lady Kitty turned to modelling after graduating, and is signed with high profile London agent, Storm Management.

She has fronted campaigns and walked the runway for luxury brand Dolce & Gabbana.

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Lady Kitty Spencer at the wedding of Prince Harry and Meghan Markle. Photo / Getty Images
Lady Kitty Spencer at the wedding of Prince Harry and Meghan Markle. Photo / Getty Images

She is also involved with several charities, as an ambassador for Centrepoint, which supports homeless young people, and a patron for Give Us Time, which funds holidays for military families.

Following in her aunty's footsteps, Lady Kitty has also worked with the Elton John AIDS Foundation.