On Sept. 18, Princess Beatrice and her husband Edoardo Mapelli Mozzi welcomed a baby girl into the world. At the time, the Royal Family shared an official statement, but the name of the little girl was not revealed.

This is the name of Princess Beatrice's daughter

Now, the time has finally come and Beatrice's husband announced what they've named their daughter. The little girl bears the wonderful name of Sienna Elizabeth Mapelli Mozzi.

The name Sienna refers to Edoardo's Italian roots, while Elizabeth pays homage to the baby's great-grandmother Queen Elizabeth.

With his post, Edoardo added a sweet declaration of love to his little daughter: "Our life together has just begun, and I can't wait to see all the amazing things that await us," he wrote.

"This week, a friend said to me the sweetest saying….that with every child you grow a whole new heart," added Edoardo, who is now a father to the baby girl in addition to a son, Wolfie, from a previous relationship.

On Twitter, Beatrice shared the same photo and wrote: "We are delighted to share that we have named our daughter Sienna Elizabeth Mapelli Mozzi. We are all doing well and Wolfie is the best big brother to Sienna."

Little Sienna is Beatrice and Edoardo's first child together. She stands 11th in line to the British throne and is the 12th great-grandchild of the Queen.