The expectant couple are said to have shared their baby news with the Royal Family on Friday as Princess Eugenie tied the knot with Jack Brooksbank at St George's chapel.

By choosing the wedding day to break the news to their family, the Duke and Duchess of Sussex will have broken an unwritten rule of sharing big news at a wedding, and possibly taking attention away from the bride.

As the news of the new royal baby swept the world, Sarah Ferguson gushed that she was "so proud of Eugenie and Jack" after the lavish ceremony that saw 850 A-listers flock to Windsor.

The Duke and Duchess of Sussex had sparked pregnancy rumours during the Royal Wedding – held at the same chapel where they tied the knot just five months ago – when Meghan wore an oversized blue coat.

The 37-year-old's look for the big day was a far cry from the sleek dresses she has usually stunned in for royal events.

Meghan wore a large blue coat for Princess Eugenie's wedding

But the Duchess of York, nicknamed "Fergie", today made sure to keep her focus on Princess Eugenie – tweeting out the congratulatory message barely 40 minutes after Kensington Palace shared the baby news.

She later added: "Andrew and I are proud to welcome Jack to the York family."

The proud mum shared a series of photos of her daughter's big day, including the newlyweds leaving the chapel after saying "I Do".

It comes after pregnancy rumours for Meghan and Harry were today confirmed by Kensington Palace.

What we know so far:

• Meghan and Harry are expecting their first child, Kensington Palace announced this morning.
• Rumours were swirling after Meghan appeared in a loose blue coat at Princess Eugenie's wedding and was seen clutching purple folders in front of her to hide her bump.
• The Duke and Duchess of Sussex arrived in Sydney today on the first leg of their Australia tour.
• Their first child will be seventh in line to the throne and is due in Spring next year.
• Meghan's best friend Jessica Mulroney and her husband are flying in from Canada to accompany the couple in an 'unofficial' capacity on their trip.
• The couple's first major international tour together will take them through Australia, Fiji, Tonga and New Zealand over 16 packed days.
• The Palace has dismissed concerns over the Zika virus, saying Meghan had consulted with doctors ahead of the trip to Fiji and Tonga.
• Meghan's mum Doria Ragland was spotted attending baby care classes in California, sparking rumours that she could be her first grandchild's nanny.

The Palace this morning wrote: "Their Royal Highnesses The Duke and Duchess of Sussex are very pleased to announce that The Duchess of Sussex is expecting a baby in the Spring of 2019.

"Their Royal Highnesses have appreciated all of the support they have received from people around the world since their wedding in May and are delighted to be able to share this happy news with the public."

Prince Harry and Meghan's baby will be the seventh in line to the throne.

This means that Princess Eugenie will be tenth in line to the throne.

Eagle eyed fans had been quick to suggest Meghan was pregnant after her attire at the Royal wedding, as well as after she arrived in Sydney overnight.

The Duchess of Sussex was pictured clutching purple binders in front of her stomach as she and Prince Harry, 34, arrived for their first international tour as a married couple.

Meghan, who has never been to Australia before, beamed as she was ushered into a car with Prince Harry.

The Queen, the Duke of Edinburgh, the Prince of Wales, the Duchess of Cornwall and Duke and Duchess of Cambridge are said to be "delighted" for the couple.

Royal sources have suggested Meghan's mother Doria may move to London from the US to help the newlyweds with their new arrival.

However, Kensington Palace today refused to say whether Meghan's dad Thomas had been told about the baby news.

Kensington Palace said the Queen is “delighted” by the news.

But when the Sun Online asked if Meghan's dad had been informed we were told they were making "no comment."

The new royal baby will likely take the surname Sussex – similar to how Prince William's children, George, Charlotte and Louis have all taken Cambridge as their last name.

Princesses Eugenie and Beatrice have also previously used York as their surname – in recognition to their dad Prince Andrew's title as the Duke of York.

In response to the royal baby news, Prime Minister Theresa May said: "My warmest congratulations to the Duke and Duchess of Sussex on the happy news they are expecting a baby in the spring. Wishing them all the best."

Woody Johnson, the US ambassador to the UK, was among the first to respond to the royal baby, tweeting: "Happy news to wake up to on a Monday morning – congratulations to the Duke and Duchess of Sussex!!"

And Grant Harrold, a former butler to Charles, William and Harry, tweeted: "Congratulations to The Duke and Duchess of Sussex who are expecting their first child in the spring."

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