Princess Beatrice and her husband Edoardo Mapelli Mozzi have announced they are expecting their second child in 2025 - but there was a huge hint about the pregnancy that everyone missed

Princess Beatrice and Edoardo Mapelli Mozzi's Relationship Timeline ... Ernie and Sienna will be over the moon to have the fifth member of the five aside!" the Duchess of York wrote on Instagram on Oct. 1. Can't get enough of PEOPLE's Royals coverage?

Princess Beatrice's mother, Sarah, Duchess of York, is "filled with happiness and gratitude" at the thought of being a grandmother again.

Princess Beatrice has kept her 3-year-old daughter, Sienna, out of the spotlight, but royal fans were treated to an adorable new photo of the toddler on Oct. 1 as Buckingham Palace announced Beatrice was pregnant with her second child.