The watchmaker collaborated with Casiraghi on a new range of jewelry and marked the launch with a dinner in Cannes.
The granddaughter of Grace Kelly is said to be expecting a child with her partner, Dimitri Rassam.
The couple’s firstborn child has been named Stefano Ercole Carlo, paying tribute to Casiraghi’s father.
The long pink-and-gold lace silk chiffon Valentino Haute Couture cape dress was an adaptation of a look from the spring 2015 collection.
The Monaco royal stars in the new advertising campaign for Montblanc’s Bohème line of watches and jewelry.