Meghan, Duchess of Sussex, Prince Harry, Duke of Sussex and Prince William, Duke of Cambridge watch a flypast to mark the centenary of the Royal Air Force from the balcony of Buckingham Palace

Meghan Marklewas born on Aug. 4 — a date that was already circled on the royal calendar forPrince William.

The Duchess of Sussexturned 42on Friday and is expected tomark the milestoneprivately following adate nightwithPrince Harryin California earlier this week. Before she married Harry in 2018, Aug. 4 was already a significant day in royal history as Prince William’s christening day.

Royals at Prince William’s christening in 1982.PA Images via Getty

The Royal Family gather for Prince William’s Christening. (top l-r) The Prince of Wales and The Duke of Edinburgh. (seated l-r) The Queen, Princess of Wales (holding Prince William), and the Queen Mother.

PA Images via Getty

Before he was christened, Prince William’s baptism day was already marked on the royal calendar for a festive reason — the Queen Mother’s birthday! Queen Elizabeth’s mother was born on Aug. 4, 1900 and died at age 101 in March 2002.

In his memoirSpare,released in January, Prince Harry shared the sweet story of when his father, who is now known as King Charles, realized Meghan was born on the same day as his beloved grandmother.

According to the text, Prince Harry, 38, said the connection came up when he and Meghan visited Charles in Scotland at theCastle of Meyduring the summer of 2018.

The Queen Mother and Prince Charles at her 100th birthday celebration in 2000.UK Press/Getty

Prince Charles sits next to the Queen Mother as she waves to admirers on the occassion of her 100th birthday celebration August 4, 2000 in London. Buckingham Palace announced March 30, 2002 that the Queen Mother has died

UK Press/Getty

“The bond between Meg and Pa, always strong, grew even stronger during that weekend. One night, over pre-dinner cocktails, Fred Astaire playing in the background, it emerged that Meg shared a birthdate with Pa’s favorite person: Gan-Gan,” Harry wrote inSpare, referring to his great-grandmother, the Queen Mother.

“ ’Amazing,’ Pa said with a smile,” he added of his dad’s reaction.

“At the memory of Gan-Gan, and the link between her and my bride, he suddenly became buoyant, telling stories I’d never heard, essentially performing, showing off for her,” Prince Harry wrote in Spare.

Meghan, Duchess of Sussex and Prince Harry, Duke of Sussex attend The Endeavour Fund Awards

The Italian restaurant is a celebrity hotspot, attracting famous faces such as Kevin Costner, Kenny Loggins and Kourtney Kardashian and Travis Barker — who may have crossed paths with Meghan and Harry during the night out as the drummer shared a picture on his Instagram story from inside the restaurant on Wednesday.

“From what I gathered, they enjoyed their food and had a nice time,” a source tells PEOPLE.

The couple moved from the U.K. to California in 2020 after stepping back from their royal roles, and a family insidertells PEOPLE exclusively in this week’s cover storythat for Prince Harry, it’s a “very different” life but one he “seems to be embracing.”

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A photo of Prince Harry, Princess Lilibet, Meghan Markle and Prince Archie from the December 2022 docuseries ‘Harry & Meghan’ on Netflix.Netflix/Youtube

https://www.youtube.com/watch?v=f9WMpiH8qd8 Harry & Meghan | Official Trailer 2 | Netflix Credit: Netflix/Youtube

Despite their public outings to restaurants, the beach and local markets, Harry and Meghan largely keep to themselves. They work out of a shared office inside their sprawling $14.65 million estate, which boasts chicken coops, a playground and a vegetable garden.

“They’re not into a big scene. They prefer smaller group hangouts at home, karaoke, that sort of thing,” says a friend. (Of the two, Harry is more frequently out and about.)

On their priorities now, a source says Meghan “just wants tofocus on their kidsand their life in Montecito.”

The Duke and Duchess of Sussex “are very united when it comes to family values and how to raise their kids. They are both great parents,” the source adds. “Their kids are their world.”

source: people.com