Meghan Markle and Prince Harry are sharing a new photo of their little girl! On Monday, the couple shared a picture of their daughter, Lilibet, which was taken during her first birthday party at Frogmore Cottage. A source is giving ET details about the celebration, revealing there were several relatives in attendance, including Princess Anne's children, Zara Tindall and Peter Phillips, along with their spouses and children. The source also notes the party on Saturday was an opportunity for the young children who are close in age to spend some time together. The insider says that it was low-key and relaxed with a birthday cake for all the kids to enjoy.