The 29-year-old is set to wed her fiancé, Michael Lewis, 61, after getting engaged just before Christmas.
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Kitty was photographed at the Alberta Ferretti after-party at the Palazzo Donizetti, sporting a figure hugging red silk gown.
The news comes after reports claim that the influencer is set to convert to Judaism for her soon-to-be husband.
The Sunday Times, ran a report claiming she is "taking religious instruction" as she prepares to marry her fashion tycoon beau.
Lady Kitty Spencer, the niece of Princess Diana, has flashed her stunning engagement ring as she hit Milan Fashion Week.
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Kitty was photographed at the Alberta Ferretti after-party at the Palazzo Donizetti, sporting a figure hugging red silk gown.
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Lady Kitty Spencer.
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“She’s been in Cape Town for the holidays and told her mother and the rest of the family. Michael is loved by all of them. Despite his wealth, he’s very humble and low key,” a pal told theDaily Mail.
South African-born Michael is a chairman of the South African retailer Foschini and is said to be worth a staggering $152 million.