Rihanna hopped on a plane from New York City to Los Angeles just to take part in Oscar weekend festivities. What multi-millionaire wouldn't travel for a good party?The singer, who attended a Bergdorf Goodman party for her Fenty line on Friday night, spent her Sunday evening at Beyoncé and Jay-Z's famous Oscar after party. RiRi dressed fabulously for the occasion, wearing an asymmetrical Alexandre Vauthier black ruffle dress.