It is believed the couple shared the happy news with family members including the Prince of Wales, for whom the baby will be his fifth grandchild, as well as the Queen and the Duke of Edinburgh and the Duke and Duchess of Cambridge.
The couple are understood to have chosen to reveal the news on Valentine’s Day “because they were happy and they liked the idea” that it was a day to celebrate love.
The timing also echoes that of the announcement made by Diana, Princess of Wales, who revealed she was expecting her second child, Prince Harry, on February 13, 1984, news that was reported in the newspapers on Valentine’s Day.
Speaking to British Vogue after the latest announcement, Mr Harriman said: “To be asked to help share this absolute joy after such an unimaginable loss and heartache is a marker of true friendship.
“Meg reminded me that had I not introduced her to a mutual friend then she wouldn’t have met Harry.
“I’m grateful for whatever small part I played.”
On how he captured the image, he said: “With the tree of life behind them and the garden representing fertility, life and moving forward, they didn’t need any direction, because they are, and always have been, waltzing through life together as absolute soulmates.”
When is the baby due?
It is thought that Meghan, 39, is around five months pregnant and is due in early summer.
Where is the second baby in the line of succession?
The baby, the Queen’s tenth great-grandchild, will be eighth in line to the throne.
The first seven places will remain unchanged – the Prince of Wales, the Duke of Cambridge, Prince George, Princess Charlotte, Prince Louis, Harry, and Archie.
Harry retained his place in the line of succession despite quitting royal life, and dropping his HRH style.
When the new addition arrives, the Duke of York, who was born second in line in 1960, will move down to ninth place.
Will the baby get a title?
The new baby will be allowed to be a Lord or a Lady, but, in keeping with Harry and Meghan’s wishes, will be a plain Master, like Archie, or Miss (first name) Mountbatten-Windsor instead.
The baby will, however, like Archie, be entitled to be an HRH and a prince or princess when the Prince of Wales accedes to the throne – although it is thought unlikely that Harry and Meghan will opt for such a change.
The new baby will not require the monarch’s permission to marry.
When the couple named their son Archie Harrison Mountbatten-Windsor, the Duke and Duchess signified they would not use a title for their first born.
He could have become Earl of Dumbarton – one of Prince Harry’s subsidiary titles – or been Lord Archie Mountbatten-Windsor, but instead he is Master Archie Mountbatten-Windsor.
The Duke and Duchess broke with royal convention by making a personal decision not to use a title, thought to be inspired by Harry’s wish to have been a normal child, rather than a prince, as he grew up.
A source said of Archie’s name: “They have chosen not to use a courtesy title at this time.”
Where will the baby be born?
The Duchess is expected to welcome her second child overseas.
He or she will be the most senior royal in the current line of succession to have been born abroad.
Alex Apati, of Ladbrokes, said: “Archie was a modern twist on a traditional name, so it’s no surprise Charles/Charlie are up there as things stand at 5-1 apiece.”
Other names favoured by punters include Elizabeth and Philip – the names of Harry’s grandparents the Queen and Duke of Edinburgh – with odds of 6-1, while Diana, the name of the duke’s mother, is priced at 10-1.
Diana is the joint favourite with bookmaker Coral with odds of 10-1 alongside Thomas, the moniker of Meghan’s father Thomas Markle.
The firm has priced Spencer at 12-1 and Albert, Philip and Elizabeth, all 16-1, are the other names near the top of Coral’s market.
Coral’s Harry Aitkenhead said: “Spencer, Albert and Philip are all in the mix, whilst Alice and Emma are two outside picks for girls’ names.”
Oliver and Diana are the joint 8-1 favourites with Betfair for the new baby, with an outside bet the 25-1 name Doria – the moniker of Meghan’s mother Doria Ragland.
Betfair spokesperson Sam Rosbottom said: “Having picked Archie – a name that wasn’t even on our list, for their first child – the odds suggest Meghan and Prince Harry could opt for a more traditional name for their second with Oliver and Diana the joint 8/1 favourites with Betfair.
“Other names with royal connections are also towards the top of the betting including Arthur and Grace, both at 10-1, and Philip, Albert, George and Isabella all at 12-1.”
What have family members said so far?
Her Majesty, the Duke of Edinburgh, the Prince of Wales and the “entire family” are “delighted” and wish them well, Buckingham Palace said.
What have Meghan and Harry said about parenthood so far?
The Duke and Duchess both had long-held ambitions to become parents.
Meghan once described motherhood as being on her “bucket list”, while Harry often told how he would love to have children, particularly after the Duke and Duchess of Cambridge had their own.
Archie Harrison Mountbatten-Windsor was born on May 6, 2019, and the Duke described his birth as “the most amazing experience I could ever have possibly imagined”.
Introducing the two-day-old to the world at Windsor Castle, Meghan said: “It’s magic, it’s pretty amazing. I have the two best guys in the world so I’m really happy.”
“He has the sweetest temperament, he’s really calm.”
Days after Archie’s birth, the couple were asked about their new life as parents.
“It’s great. Parenting is amazing. It’s only been two-and-a-half days, three days, but we’re just so thrilled to have our own little bundle of joy,” Harry said.
Meghan added: “He’s just been the dream so it’s been a special couple of days.”
The couple are protective of Archie’s privacy, and will be perhaps even more so with their new baby, after stepping down from royal duties.
It is thought unlikely the couple will introduce the new member of their family in the same way.
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