Rihanna is said to be “upset” after nude photographs leaked of her early last month have cost her a place on the front cover of American Vogue.  Insiders have told Star Magazine that notorious editor Anna Wintour approached Rihanna at the Met Costume Institute Gala in New York and offered her the prestigious cover, “Anna told her Vogue absolutely loves her,” a source claimed before saying the offer was retracted when naked pictures of the R & B star appeared online early last month.  “Anna hasn’t returned any of her calls. Rihanna’s so upset. She hopes the people at Vogue change their minds.”