The Duke and Duchess of Sussex told the Royal Family about Meghan's pregnancy at Princess Eugenie and Jack Brooksbank's wedding three days ago, it emerged today.
Harry and Meghan had attended the ceremony and reception along with most other senior members of The Firm at St George's Chapel in Windsor Castle on Friday.
The couple then arrived in Sydney today ahead of a hotly-anticipated 16-day tour which will take in Australia, New Zealand, Fiji and Tonga.
Harry and Meghan were wed at Windsor Castle in May and the news was announced on the eve of their first tour outside the UK and Ireland.
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.