Rihanna Los Angeles - Arabstoday Rihanna attended a Halloween party in LA, but unlike the normal celebrity tradition of over the top horror attire, the “Diamonds” star chose glam over gore. She opted to wear a black lace skirt and top with mesh boots at the annual West Hollywood Halloween Carnaval. The singer was awarded a crown and a key to the city by the mayor at Greystone Manor nightclub, before heading inside to host an All Hallows\' Eve bash with famous friends including Flo Rida and Paris Hilton.