Zara Tindall, Queen Elizabeth's eldest granddaughter, is pregnant with her third child

Zara Phillips Tindall, the eldest granddaughter to Queen Elizabeth II, is expecting her third child, Buckingham Palace confirmed. 

"The Queen and The Duke of Edinburgh are aware and delighted," the palace told USA TODAY. 

Tindall, the only daughter to Princess Anne and 18th in line to the British throne, has two daughters with her husband Mike Tindall, a 42-year-old former English rugby player: 6-year-old Mia Grace and 2-year-old Lena Elizabeth. Tindall, 39, suffered a miscarriage in 2016 before welcoming Lena two years later. 

Princess Eugenie, Zara Tindall's cousin, is also expecting her first baby with husband Jack Brooksbank in early 2021. The Tindalls did not announce a due date, but combined with Eugenie's upcoming bundle of joy, the queen has her ninth and tenth great-grandchildren on the way next year. 

"Jack and I are so excited for early 2021....👶🏻" Eugenie captioned a photo of her and Brooksbank holding up a pair of baby slippers in September. 

Including the two Tindall girls, Queen Elizabeth has eight great-grandchildren: Prince William and Duchess Kate's 7-year-old son Prince George, 5-year-old Princess Charlotte and 2-year-old Prince Louis; Prince Harry and Duchess Meghan's 1-year-old son Archie Harrison Mountbatten-Windsor; plus Peter and Autumn Phillips' 9-year-old daughter Savannah and 8-year-old daughter Isla.