Express reported the monarch was aware of the happy event but was not prepared for Harry and Meghan to share it with the world when photographer Misan Harriman released a socially distanced photo of the former American actress tenderly cradling her pregnant belly.
The black-and-white image showed the duo as they relaxed in a tranquil outdoor area.
Meghan is visibly pregnant in the photo seen below. The couple has not yet announced when the Duchess of Sussex will deliver her second child.
The queen also has not yet released a prepared statement regarding the birth of her 10th great-grandchild.
The royal family last announced in a February 10 Instagram post, seen here, that the monarch and her husband Prince Philip were delighted Princess Eugenie and her husband Jack Brooksbank had welcomed their first child, a son.
Emily Andrews, Mail on Sunday royal editor, wrote on Twitter that the couple told the royal family about the pregnancy, but made no mention about when they would go public with the news.