A source tells PEOPLE that Casiraghi is “due late this summer, early September.”

The child will be the seventh grandchild forPrincess Caroline(the 62-year-old royal’s clan haswelcomed two additions since April) and the second grandchild for Dimitri’s mother, glamorous French actress and former Bond girl (For Your Eyes Only) Carole Bouquet.

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Day 3 - Global Champions Tour of Monaco 2018

Day 3 - Global Champions Tour of Monaco 2018

Casiraghi and Rassam got engaged in March while on ski vacation in Zurs, Austria, with Princess Caroline. Their wedding plans remain secretive. Initially, it was speculated that they might marry as early as this month.

While an early October date has now been mentioned around Monaco, a source tells PEOPLE that plans now suggest a civil ceremony in December (their second anniversary as a couple), with a larger family wedding, similar to theglamorous 2015 ceremony of Beatrice Borromeo and Charlotte’s younger brother Pierre, scheduled for next spring.

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That event, sources indicate will be held in privacy at Bouquet’s 12-acre vineyard on the Italian island of Pantelleria.

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The eldest granddaughter ofGrace Kellyand the film producer, who have been inseparable since, split their time between L.A., Paris and Monaco. Both are graduates of the Sorbonne University in Paris, and each have children from previous relationships: Charlotte has a 4-year old son, Raphael, with comedian Gad Elmaleh, and Dimitri has a daughter from his marriage to model Masha Novoselova.

Philadelphia-born Grace Kelly became Princess Grace when she wed Prince Rainier of Monaco in 1956. When Grace — an Oscar-winning superstar who left her acting career after becoming a royal — returned to Philadelphia as a royal mom, the home continued to be a joyful refuge.

Michael Calcagno

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“She seemed to have a very happy childhood, and it was a lot of games, a lot of fun things that were happening there,” Prince Albert, whorecently unveiled the new restorationof his late mother’s childhood home, told PEOPLE, “and it felt like a real family home. It was a real place of gathering and rejoicing.”

source: people.com