May 19, 2011 3:24 pm Madonna Pays Tribute to Oprah Before Her Farewell Special Madonna chats about her decision to appear on Oprah Winfrey’s farewell special and describes how the “Big O” has served as a role model in her own life. US & World Videos 1:45 NYPD enters Columbia University in riot gear to clear protest 4:28 ‘Apples Never Fall' and ‘Jurassic Park' star Sam Neill reveals his real name 3:21 Katy Perry's surprising regret about cheeseburger Met Gala look 1:01 Biden administration plans to reclassify marijuana as a Schedule III drug 2:28 King Charles returns to public duties amid cancer diagnosis