At 11:45 a.m., in Monaco, Andrea Casiraghi, eldest son of Princess Caroline, and the New York-born Tatiana Santo Domingo were married in a private civil ceremony by the marina in Monaco.
According to the press reports, between 300 and 450 guests attended the ceremony, which was followed by a reception in the Princely palace gardens.
The civil ceremony legitimizes the couple's son, Sacha, who was born last March in a London hospital.
The couple have been dating for some years, and became engaged last year.
Although Andrea is second in line to the Monaco throne, he is not a member of the princely family, and his comings and goings are not announced by the Prince of Monaco's office. Andrea is a nephew of Prince Albert II, but he is not a Grimaldi.
Princess Caroline's office sent out press releases regarding the engagement and the birth of Sacha. The latter announcement was made jointly with Tatiana's Brazilian mother, Vera Rechulski.
Tatiana is also the daughter of the late Julio Santo Domingo, a member of one of Colombia's wealthiest families.
So far no details about the actual ceremony have been released to the media, apart from a confirmation that the wedding took place. Observers could hear applause, however, at the time the couple said I do (in French), and were pronounced husband and wife.
It is understood that the family may release several photos to the media later today. Earlier this week, Tatiana's aunt, Lauren Santo Domingo tweeted a photo taken at Tatiana's bridal party, which took place on a private yacht.
Sacha Casiraghi is now third in line.