Britain's biggest commercial broadcaster has commissioned the program from Oxford Films, which made the successful ITV and HBO Princess Diana documentary "Diana, Our Mother: Her Life and Legacy" that featured rare interviews with princes William and Harry.
Meghan said, "It's very sweet".
"As soon as he saw the bum bump [which stops the baby slipping down] he understood immediately".
The wedding of British royal Harry to American actress Markle has sent United Kingdom tabloids into a frenzy, with many column inches this week devoted to the cake the couple will have on their big day. Prince Harry and Meghan will get married at St. George's Chapel in Windsor Castle on Saturday May 19. "He said: "Oh, non-slip".
Meghan stepped out in a teal, fitted Greta Constantine skirt, brown pumps and an off-white sweater, but perhaps what was most astounding about her style is how she managed to make a messy side bun look so flawless.
Meghan Markle has babies on the brain! "Hopefully we'll start a family in the near future", he said when the couple was asked about having children.
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They had lunch at the popular Crown Liquor Saloon, a landmark in central Belfast.
Prince Harry and his fiancée will later be travelling to the Belfast campus of Northern Ireland's next generation science park, Catalyst Inc.
Royal memorabilia fetches anything between £10 to well over £1000 on eBay, meaning those who snap up Harry and Meghan's china could be sitting on a pretty penny in years to come. They are also visiting some of Belfast's most loved sites.
The couple were also promised an early wedding present: bespoke spades made by Colin Dawson of the National Trust's Patterson spade mill, the man who has provided personal spades for the Queen and Prince Charles.
The couple toured the £97million Titanic Belfast museum which tells the story of the liner which sank in 1912.
As the duo arrived at wonderful the Space, they were welcomed by 2,000 students who had no prior knowledge of the visit, according to People magazine.