May 8, 2009 6:22 pm Rihanna Steps Out to Fight Leukemia Rihanna presented an award at the 3rd Annual DKMS Gala to a little girl named Isabell who is courageously helping her best friend Jasmina fight leukemia. US & World Videos 0:37 Ex-Abercrombie CEO arrested on sex trafficking-related charges 9:07 Selena Gomez and Benny Blanco's sweetest moments 0:31 The price to watch Lionel Messi in Los Angeles 2:13 Real-life ‘Karate Kid' meets his inspiration 2:12 What to expect in court as Trump faces 2020 election charges in DC