Pierre Casiraghi and Beatrice Borromeo are set to marry in the bride's native Italy in August, but before their religious wedding, the couple will legally tie the knot in a civil ceremony. This first celebration will take place on Saturday 25 July in Monaco, one week before the main event.
According to Italian publication Dagospia, who have obtained a photograph of the invite, Pierre – Princess Caroline of Monaco's younger son – and his bride Beatrice will make their union official at 12 noon in the gardens of the Grimaldi palace.
Guests have been asked to wear cocktail attire, and will toast to the newlyweds after the ceremony.
Pierre Casiraghi and Beatrice Borromeo will have a civil ceremony on Saturday 25 July
On the morning of the civil service, a few select guests will attend a breakfast at the luxurious Fairmont Hotel in Monte Carlo, organised by the bride's Italian mother Countess Donna Paola Marzotto.
One week later on Saturday 1 August the religious ceremony, which will be a bigger and grander affair, will take place in the bride's native country of Italy.
Guests will fly over to the Borromean islands on Lake Maggiore, owned by Beatrice's family, where they will see Pierre, 27, and Beatrice, 29, tie the knot for a second time.
"I'd love if Pierre became the father of my children," Beatrice has previously said
While few details have been made public about the upcoming wedding, Dagospia has reported that the couple will most likely marry on the Isola Bella.
The island, which is a popular tourist attraction, is home to a palace, an Italianate garden and a small fishing village. It is also the same location where Beatrice's older half-sister Matilde Borromeo married Prince Antonius von Fürstenberg in June 2011.
The nearlyweds have been together for seven years after meeting at university
Pierre and Beatrice met while studying at university in Milan in 2008 and six years later Prince Albert's nephew popped the question with a pink diamond ring.
The stunning Beatrice, who is a well-known journalist and TV presenter, has previously spoken about wanting to start a family.
"I'd love if Pierre became the father of my children," Beatrice told Vanity Fair Italy. "He would be so good and I think together we could create a very stable family. But we haven't reached that point yet. At the moment we are both happy. But one day I would like the responsibility of a family."