The royal is pregnant with her second child with husband Edoardo Mapelli Mozzi—see the latest look she donned while stepping out at a costume party.

Two days after announcing her pregnancy, Princess Beatrice stepped out for a star-studded party in London. The royal attended Chiltern Firehouse's 10th anniversary party on Oct. 3. Photos published by the Daily Mail and The Telegraph show King Charles' 36-year-old niece dressed in an all-black outfit and holding a masquerade mask.

Princess Beatrice’s mother, Sarah Ferguson, seems to be nothing but excited -- and proud -- of her daughter’s recently pregnancy announcement.

Dave Benett/Getty Images; The Royal Family/X Princess Eugenie is celebrating her sister Princess Beatrice's baby on the way. On Oct. 1, Buckingham Palace announced that Princess Beatrice, 36, is pregnant and expecting her second child with her husband ...

Princess Eugenie recently shared a sweet insight into the relationship she shares with her sister Princess Beatrice. Eugenie is a mother of two and Beatrice has one son with another baby on the way and as it turns out, the two love to swap parenting advice with one another.

Princess Beatrice is a mom and a stepmom! The royal – who is fifth in line to the British royal throne — recently announced that she is pregnant and expecting her second child. Now that Beatrice is expanding her family, learn more about how many kids she has and who her husband is, below!

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.