The pair were married on May 19 in a lavish wedding ceremony at Windsor Castle which was watched by millions of viewers around the world.
In 1917, King George V (Prince Harry's great-great-grandfather) reduced the amount of titles within the royal family, although Queen Elizabeth II could make an exception and allow Prince Harry and Meghan Markle's children to receive HRH (His or Her Royal Highness) titles.
Prince Harry and his wife, Meghan, Duchess of Sussex, arrived in Sydney yesterday, a day before they officially start a 16-day tour of Australia, New Zealand and the South Pacific.
Eagle-eyed royal fans have spotted a touching tribute to Princess Diana in Meghan's outfit during the first day of royal tour duties in Sydney.
Sylvia, who seemed reluctant to relay the question, then said to Daphne: 'I'm not sure this is appropriate. but Karl would like to know what Prince Harry smells like'.
Markle's mother Doria Ragland also released a statement through Kensington Palace on Monday to say she is "very happy" about her daughter's expectancy.
Trump hails 'truly attractive bride Princess Eugenie but gets wedding date wrong
The Queen has always thought to have liked Sarah, but Prince Philip can not stand to be in the same room as her, it is understood. During their royal engagements and public appearances, Prince William and Kate Middleton are very reserved with one another.
The decision came after consultations with doctors, Kensington Palace said.
Meghan and 34-year-old Harry will be welcoming their baby in spring 2019.
According to Thomas, his daughter the Duchess "cut me out completely" and he is unable to communicate with her via her personal aides.
The Duke and Duchess of Sussex have begun their first overseas tour as news of Meghan's pregnancy made headlines across the globe.
Before their meet-and-greet, Meghan and Harry enjoyed a performance by the Bangarra Dance Company at the Sydney Opera House, having travelled to the iconic landmark via ferry from Taronga Zoo.
Meghan made her name in acting as savvy paralegal Rachel Zane in the USA television legal drama "Suits", a world far removed from Buckingham Palace. "Hopefully next time we see you we'll have a little one with us".
Tuesday is the first opportunity for the public to interact with the couple - and to be the first to congratulate the royal couple.
The Queen and other senior royals were told about the pregnancy on Friday, when they gathered in Windsor for Princess Eugenie's wedding.