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Britain's Prince Harry, Duke of Sussex and his wife, Britain's Meghan Markle, Duchess of Sussex leave St George's Chapel after their wedding ceremony in Windsor Castle, in Windsor, on May 19, 2018.

This means any daughters they might have will not inherit the Dukedom, and the title will die out completely if Harry and Meghan only have girls.

However, rules regarding males and females have changed in the past.

This is expected to be Meghan's first official engagement without Harry, and among her first appearances following their honeymoon. None of his eight daughters, led by Amanda Murray, inherited the title. The newlyweds' future sons will get to carry on their father's titles of Duke of Sussex, Earl of Dumbarton and Baron Kilkeel. As per recent reports, although Meghan has not really revealed about babies in recent times, but she definitely has some plans for her future baby.

However, Harry's grandmother Queen Elizabeth II has the power to change this - like she did for Prince William and Kate Middleton's children.

Ahead of their wedding, the couple had requested that in lieu of gifts, well-wishers make a donation to a selection of charities the Duke and Duchess had chosen that represent their philanthropic passions.

According to the Royal Family's website, the pair will open the Mersey Gateway Bridge at Catalyst Science Discovery Centre on June 14. "She doesn't want 70 years of hard work to be for nothing". They looked so happy, and everybody was just so happy for them.

Meanwhile, it's been announced Meghan will join The Queen for a series of engagements in Chester next week, marking the first time Meghan's carried out a royal duty with the monarch and without her husband.

Harry and Markle are now believed to be on their honeymoon, though they are expected to attend the Queen's Trooping of the Colour official birthday parade this Saturday.