[President Bill Clinton, Petra Nemcova via Andrew H. Walker/Getty Images for Happy Hearts Fund][Sheryl Crow, Apl.de.ap via Andrew H. Walker/Getty Images for Happy Hearts Fund][Naomi Watts, Apl.de.ap, Petra Nemcova via Andrew H. Walker/Getty Images for Happy Hearts Fund][Petra Nemcova, Naomi Watts via Andrew H. Walker/Getty Images for Happy Hearts Fund]