Lady Eliza Spencer also has a twin sister, Lady Amelia Spencer

Princess Diana's niece, Lady Eliza Spencer, has offered a playful glimpse into her wedding preparations by sporting a personalised swimsuit bearing the words "Future Mrs M" across its open back, a nod to her fiancé, tech executive Channing Millerd.

The 34-year-old daughter of Earl Spencer shared a series of photographs on Instagram from the five-star Palazzo Avino resort on Italy's Amalfi Coast, where she and Mr Millerd, 35, are scouting potential ceremony locations.

Wearing a white floral-strapped one-piece from ALT's "Lila" range, priced at £150, paired with a sheer robe and sunglasses, she captioned the 10 images: "Wedding venue hunting begins... @palazzoavino you have completely stolen our hearts."

Her twin sister Lady Amelia Spencer responded enthusiastically, commenting "Wow wow wow wow," while brother-in-law Greg Mallett, who originally introduced the couple back in 2016, wrote: "So beautiful Lala."

Mr Millerd proposed during a candlelit dinner overlooking the sea in Santorini last July, after the pair had been together for nine years.

He told Hello! that the length of their relationship meant the pressure was on to make the moment truly memorable, explaining he wanted to make Eliza "feel as special as I possibly could".

Recalling the proposal to Tatler, Lady Eliza said: "I laughed and I cried. I don't know how he pulled it all off, but it was so special."

The entrepreneur sourced a 2.5-carat pear-shaped diamond from a bespoke Cape Town jeweller with assistance from his father and brother-in-law, before designing the ring himself. Valued at approximately £40,000, the stone's halo setting echoes the iconic ring worn by the late Princess Diana.

The couple have expressed a preference for a destination wedding, with Lake Como among the venues under consideration alongside the Amalfi Coast, though specific details about the ceremony remain largely under wraps.

Lady Eliza relocated to South Africa in 1995, where she grew up far from the media spotlight that surrounded her family.

She described the ring as "perfect" and "so special that it's from South Africa," reflecting her deep connection to the country.

In January, the pair launched their wedding celebrations with a rooftop engagement gathering in Cape Town for around 50 of their closest loved ones. Lady Eliza posed alongside Mr Millerd, her sisters Lady Amelia and Lady Kitty, and their mother, former model Victoria Aitken, sharing the occasion on Instagram.

However, Earl Spencer, Princess Diana's brother, appeared not to attend the engagement party.

Charles Spencer also did not attend Lady Kitty's 2021 wedding to Michael Lewis in Italy, nor Lady Amelia's nuptials in 2023.

At Kitty's ceremony, she was walked down the aisle by her brother Louis Spencer, Viscount Althorp, rather than her father.