Rihanna, one of the most well-known pop singers in the world, has achieved six number-one singles on the Billboard Hot 100 chart including, 'Rude Boy,' Umbrella,' 'Disturbia,' and 'Don't Stop the Music.' She won two Grammys at the 2010 awards and her current tour is titled, 'Last Girl on Earth Tour.'
Added by Upcoming Robot on July 23, 2010