After meeting at a party in late 2011, the pair embarked on a discreet relationship that quickly went from whispered affair to tabloid favorite.
Pierre, 27, and Beatrice, 29, met while studying at university in Milan in 2008.
The young sweethearts were originally said to be marrying on 20 April, after Pierre popped the question with a pink diamond ring.
The stunning Beatrice, who is a well-known journalist and TV presenter, has recently spoken about wanting to start a family.
“I’d love if Pierre became the father of my children,” Beatrice told Vanity Fair Italy. But one day I would like the responsibility of a family.” The statuesque beauty is a regular at royal fixtures, and has accompanied her fiancé Pierre to events such as the annual Monaco Rose Ball and the wedding of Prince Félix of Luxembourg to Claire Lademacher.
Pierre’s siblings Andrea and Charlotte are also expected to be present, with their respective partners Tatiana Santo Domingo and Gad Elmaleh.
Members of the Monegasque royal family are expected to turn out in full force, including Pierre’s mum Princess Caroline of Monaco and her brother Prince Albert.
Aber wenn ich Flüchtlinge auf dem Feld besuche, dann ist es mir egal, was ich anhabe“, antwortete die Prinzen-Gattin darauf.
Diese ausführliche Antwort nutzte das Blatt und wollte von Beatrice wissen, ob sie bei einem Date auch Jeans tragen würde.
We've had plenty of royal unions over the past several months, so it's only natural that we get a royal breakup as well.
Charlotte Casiraghi, the 25-year-old daughter of Princess Caroline of Monaco, has reportedly split from boyfriend Alex Dellal, writes cover and a collaboration with Gucci creating equestrian clothing.
“Mostly, this is a couple that drifted apart over their careers.