Lilibet is the couple's second child; they are also parents to two-year-old Archie Harrison Mountbatten-Windsor, born in 2019.
In a statement posted on their Archewell Foundation page, the couple announced: “On June 4th, we were blessed with the arrival of our daughter, Lili. She is more than we could have ever imagined, and we remain grateful for the love and prayers we’ve felt from across the globe. Thank you for your continued kindness and support during this very special time for our family.”
Baby Lilibet, who was named after her great-grandmother (whose family nickname is Lilibet), and her grandmother, the late Princess Diana, is also Queen Elizabeth II's 11th great-grandchild.
In fact, Lilibet is not the first of the Queen's great-grandchildren to be born this year. So far, she is the third alongside Lucas Philip Tindall and August Philip Hawke Brooksbank who were both born earlier this year.
Read on to get to know the rest of the Queen's great-grandchildren.