Pierre Casiraghi (R), Beatrice Borromeo - Casiraghi (2ndR), Princess Alexandra of Hanover (2ndL) and Charlotte Casiraghi (L) arrive for the annual Rose Ball at the Monte-Carlo Sporting Club in Monaco, on March 19, 2016. The Rose Ball is one of the major charity events in Monaco. Created in 1954, it benefits the Princess Grace Foundation. / AFP / VALERY HACHE (Photo credit should read VALERY HACHE/AFP/Getty Images)
