Princess Diana’s niece Lady Kitty Spencer is engaged to her 60-year-old boyfriend

It's official ... Princess Diana's niece, Lady Kitty Spencer, is off the market.

The 29-year-old has been pictured wearing an emerald cut diamond ring, estimated to be worth up to £300,000 with 30 carats of flawless diamonds, on her wedding finger as she stepped out with her 60-year-old "silver fox" boyfriend in Cape Town this week.

The appearance comes just a few weeks after it was reported by the Daily Mail that Kitty agreed to marry the fashion tycoon after he proposed to her before Christmas.

After Christmas one of her friends told the publications: "Michael proposed to Kitty before Christmas.

"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."

The couple went public with their relationship in May last year during a stroll through New York City and were seen kissing after leaving a nightclub in St Tropez in August.

Kitty, the eldest of Earl Spencer's children, first captured international attention when she attended her cousin's Prince Harry and Meghan Markle's wedding at Windsor Castle in 2018.

The model looked incredible in a stunning green Dolce & Gabbana dress, with royal fans instantly recognising she has inherited Princess Diana's natural beauty and classy fashion sense.

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Kitty's new beau, who is worth £80 million, is six years older than her father.

The South African-born divorced father of three children – who are all in their 30s – owns a £19 million Central London mansion where Lady Kitty has also been spotted.

Kitty was born in 1990 and grew up in South Africa with her mum. She studied psychology, politics and English literature at the University of Cape Town.

She was previously in a four-year relationship with Italian property tycoon Niccolò Barattieri di San Pietro, 48.

Barattieri left her in 2017 and began a romance with Liz Hurley.