MONTE-CARLO, MONACO - MARCH 28: (L-R) Charlotte Casiraghi, Beatrice Borromeo, Pierre Casiraghi and Lily Allen attend the Rose Ball 2015 in aid of the Princess Grace Foundation at Sporting Monte-Carlo on March 28, 2015 in Monte-Carlo, Monaco. (Photo by Pierre Villard/SBM/PLS POOL/Getty Images)
