Kitty Spencer says her brothers letting her walk down the aisle was the ‘proudest moment of her life’

Newlywed Kitty Spencer looked casual when she was seen relaxing in the sun during her luxurious honeymoon on the Amalfi Coast with her billionaire fashion mogul husband.

Princess Diana’s niece, 30, married Michael Lewis, 62 – who is five years older than her father Charles Spencer – on Saturday in a 17th-century castle, surrounded by family and famous friends, including Emma Weymouth and Pixie Lott.

The socialite was spotted wearing a black lace dress and oversized sunglasses before joining her new husband, who opted for white swimming drunks and an open navy blue shirt, by the sun loungers on their honeymoon in Positano, Italy.

Lady Kitty Spencer, who had her blond hair tied back, was seen on the phone and was seen carrying a large wicker beach bag and black briefcase before diving into the crystal blue sea with Michael to cool off.

Lady Kitty Spencer, niece of Princess Diana (pictured), 30, enjoys her honeymoon in Positano with billionaire husband Michael Lewis

The newly married couple looked happy and relaxed as they chilled out enjoying the sun in sunny Positano

The newly married couple looked happy and relaxed as they chilled out enjoying the sun in sunny Positano

Princess Diana’s niece said ‘I do’ on Saturday in front of a hushed congregation at Frascati’s Villa Aldobrandini, a beautiful mansion overlooking Rome.

Photos of the bride showed her wearing a high-necked Victorian-inspired lace dress by favorite designer Dolce and Gabbana for the occasion, with trendy puff sleeves and a slim-fitting waist.

Meanwhile, she swept her hair back into a low bun and opted for a long train for the occasion.

Her husband opted for a smart white tuxedo and later Prince William and Harry’s younger cousin changed into a second dress, featuring short sleeves, pink floral details and a flowing hemline.

The newlyweds were seen descending the stairs into the sea as they took a dip to cool off from the Italian sun

The newlyweds were seen descending the stairs into the sea as they took a dip to cool off from the Italian sun

Princess Diana's niece, 30, married fashion magnate Michael, 62 - who is five years older than her father Charles Spencer - on Saturday in a 17th-century castle.  Pictured, Michael Lewis in Positano

Princess Diana’s niece, 30, married fashion magnate Michael, 62 – who is five years older than her father Charles Spencer – on Saturday in a 17th-century castle. Pictured, Michael Lewis in Positano

Lady Kitty Spencer wore a black dress with a crossover detail at the back and was seen carrying a black suitcase een

Lady Kitty Spencer wore a black dress with a crossover detail at the back and was seen carrying a black suitcase een

Michael and Kitty were joined by her sisters, twins Eliza and Amelia; Viscountess Emma Weymouth and her husband Ceawlin Thynn, the Marquess of Bath; pop star Pixie Lott and her model boyfriend Oliver Cheshire; Idris Elba’s wife Sabrina; and Made In Chelsea star Mark Vandelli.

Also in attendance were Mr Lewis’s three adult children from a previous marriage. Lady Kitty, the eldest child of Diana’s brother Earl Spencer, is said to have developed a strong bond with her husband’s children.

After the ceremony, the two were seen toasting their wedding surrounded by their closest friends and family on the villa’s balcony.

In keeping with the Italian theme, fashion house Dolce and Gabbana played a leading role. Several guests including Viscountess Weymouth, socialite and DJ Marjorie Gubelmann and fashion designer Jade Holland Cooper wore the designers’ dresses.

As the scorching summer heat began to subside at 6 p.m., Princess Diana's niece said 'I do' to a hushed congregation at Frascati's Villa Aldobrandini, a beautiful mansion overlooking Rome.

As the scorching summer heat began to subside at 6 p.m., Princess Diana’s niece said ‘I do’ to a hushed congregation at Frascati’s Villa Aldobrandini, a beautiful mansion overlooking Rome.

Before the ceremony, Viscountess Weymouth and Ms Gubelmann posted on Instagram that their outfits were made by the Italian duo, while Ms Holland Cooper showed off a small D&G handbag on the social media site.

Lady Kitty may also have chosen to wear the Spencer tiara, a diamond headpiece in a floral design of tulips and star-shaped flowers, which her aunt wore for her wedding at St Paul’s Cathedral on July 28, 1981.

After the ceremony, Lady Kitty and Mr Lewis treated the guests to a feast and dance before an incredible fireworks display lit up the Italian sky.

During the week, several friends shared posts on social media indicating that her marriage was imminent. Dutch fashion model Marpessa Hennink posted a selfie with Kitty with the words: ‘Team Bride. It’s finally going to happen.’

Lady Kitty’s siblings Lady Eliza and Amelia, 28, have both been quiet on social media in recent days as her father Charles shared a video of his Althorp House home yesterday morning.

Lady Kitty’s cousins, Prince William, 39, or Prince Harry, 36, are unlikely to have attended the event in Italy amid the ongoing Covid-19 crisis in the UK and US.

.