via guestofaguest.com: No one can master the art of yacht-hopping quite like the truly posh and privileged.  So far this week at Cannes, the most skilled of yacht-hoppers like Naomi Watts, Javier Bardem and Charlotte Casiraghi have gotten the chance to perfect their craft aboard the fanciest yachts in the world for the most fabulous parties on the Riviera. MORE>>