Lady Kitty Spencer is casual chic as she leaves Milan hotel with millionaire fiancé Michael Lewis

Lady Kitty Spencer cut a casual figure today as she left a hotel in Milan with her multi-millionaire fiancé Michael Lewis. 

Princess Diana’s niece, 29, looked chic in a pair of denim jeans, a tartan camel coat and white trainers, teamed with her 30 carat diamond engagement ring worth an estimated £300,000. 

The society model reportedly got engaged to fashion tycoon Lewis, 61, who is 32 years her senior and five years older than her father Earl Spencer, after Michael proposed in Cape Town over Christmas. 

London-born Kitty has been in the Italian city for Milan Fashion Week. She left the hotel carrying two shoulder bags and accessorised her look with oversized black sunglasses and a pair of dainty gold hoop earrings. 

Lady Kitty Spencer was spotted today donning her 30 carat diamond engagement ring worth an estimated £300,000 as she left a Milan hotel with her multi-millionaire fiance Michael Lewis

Michael, who is worth an estimated £80 million, donned a pair of blue denim jeans paired with a smart blazer and pale blue shirt. 

Their visit to Milan comes after a string of appearances at Milan Fashion Week, where Lady Kitty graced the FROW at Bulgari and Tod’s events. 

A regular at the most glamorous shows during Fashion Month, yesterday she put on a showstopping turn at the Bulgari FW 20 Leather Goods and Accessories Collection Party in Milan. 

Kitty oozed glamour in a black sequin midi dress as she posed up a storm at the swanky bash and looked sensational in the plunging gown, which cinched her in at the waist, highlighting her hourglass figure. 

Kitty looked chic in a pair of denim jeans, a tartan camel coat and a pair of white trainers while Lewis, who is worth an estimated £80 million, donned a pair of blue denim jeans paired with a smart grey blazer and pale blue shirt

Kitty looked chic in a pair of denim jeans, a tartan camel coat and a pair of white trainers while Lewis, who is worth an estimated £80 million, donned a pair of blue denim jeans paired with a smart grey blazer and pale blue shirt 

The beauty has been making quite the style statement during fashion week in the Italian city, having wowed in a ravishing scarlet gown at the Alberta Ferretti bash last Wednesday. 

She looked chic in a black and cream pleated midi-skirt teamed with a colour-coordinated collared shirt as she appeared for Tod’s autumn/winter collection the day before. 

Her shirt featured a ruched cord to cinch in her svelte waist, and she teamed the ensemble with an eye-catching pair of red slip-on mules with a miniature heel.

Kitty oozed glamour in a black sequin midi dress as she posed up a storm at the Bulgari FW 20 Leather Goods and Accessories Collection Party in Milan

Kitty oozed glamour in a black sequin midi dress as she posed up a storm at the Bulgari FW 20 Leather Goods and Accessories Collection Party in Milan 

Kitty wore her blonde tresses in flowing curls and accessorised with an elegant pair of diamond earrings, with a a neutral palette of makeup and her locks back behind her ears.

Lady Kitty and Michael went public with their relationship during a stroll through New York in May and were seen kissing after leaving Club 55 in St Tropez in August. 

An expert previously revealed that the society model was wearing an emerald cut diamond engagement ring with an estimated 30 carats of flawless diamonds.

Speaking to MailOnline, appraiser Oliver Horner from Prestige Pawnbrokers of Channel 4’s Posh Paw, said: ‘This gorgeous full hoop diamond full band engagement ring is of extremely high quality.

Kitty looked stunning in a red gown

She wore her tresses in a stylish updo at the event

The beauty had been making quite the style statement during fashion week in the Italian city, having wowed in a ravishing scarlet gown at the Alberta Ferretti bash on Wednesday

‘The full band is set with large emerald cut diamonds, each stone looks to be approximately one and a half carats and I would estimate the total diamond weight of the ring to be between 25 and 30 carats.

‘Judging from the image the diamonds look to be of exceptional quality and I estimate a clarity grade to be between flawless and VVS1 and to be of D to F colour which is the very best.

‘I believe a ring of this exceptional quality would have an would cost between £200,000 – £300,000 maybe even more given the provenance of such a piece.’

Kitty grew up in Cape Town and spent Christmas, her birthday and New Year’s Eve in South Africa, where Michael is also based.

Kitty is pictured in the front row of the Alberta Ferretti fashion show on Wednesday, looking chic in a blue suit

Kitty is pictured in the front row of the Alberta Ferretti fashion show on Wednesday, looking chic in a blue suit

Michael has three adult children and was previously married to a woman named Leola in 1985.

Kitty, who was spotted at the tycoon’s £19 million mansion in central London last summer, told the Mail at the time that she didn’t feel ‘in any rush’ to start a family.

‘I can see myself having children at some point… but I’m only in my twenties. I do have friends my age who are having children, and they are so, so, sweet, but I think everyone should do things in their own time.’

Lewis’ previous wife, Leola, 59, signed a prenuptial agreement but it’s not yet known whether Lady Kitty will do the same. 

Kitty sported a denim-look blue suit at the the Alberta Ferretti fashion show - but unfortunately the bright light of the camera flash caused her underwear to show through

Kitty sported a denim-look blue suit at the the Alberta Ferretti fashion show – but unfortunately the bright light of the camera flash caused her underwear to show through 

The model looked chic in a black and cream pleated midi-skirt teamed with a colour-coordinated collared shirt as she appeared for Tod's autumn/winter collection on Tuesday in Milan

The model looked chic in a black and cream pleated midi-skirt teamed with a colour-coordinated collared shirt as she appeared for Tod’s autumn/winter collection on Tuesday in Milan 

It was revealed last week that Kitty is converting to Judaism to demonstrate her commitment to the father-of-three, who is chair of the Foschini Group.  

Kitty is already ‘taking religious instruction’ in preparation for their marriage according to a friend of the couple. 

Her cousin, future king Prince William, 37, is a future Supreme Governor of the Church of England.

It is not yet known which branch of Judaism Kitty will convert to. She has previously been seen attending synagogue with Lewis in London.   

Read more at DailyMail.co.uk