Eugenie also posted a picture of her doting eldest son, August, lovingly touching his brother’s head. “Augie is loving being a big brother already,” she shared.
Ernest will be 13th in line to the throne, moving the Duke of Edinburgh, Prince Edward down to 14th place.
The new addition to the royal family is below his brother August Philip Hawke Brooksbank who is 12th in line.
Eugenie and Jack’s firstborn baby had originally been 11th in line to the throne when he was born in February 2021. However, the royal was bumped down the list by Prince Harry and Meghan’s daughter Lilibet, who took seventh spot in the succession line.
Ernest also marks the 13th great-grandchild of the late Queen - and is the first baby to be born since she passed away last year.
Eugenie’s sons will not receive a title or HRH status as they are not grandchildren of the current monarch King Charles.
Princess Eugenie shared a picture of her son August kissing her pregnancy bump. Photo / Instagram / Princess Eugenie