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More recently , guests have included Kevin Costner , Whoopi Goldberg , Gene Hackman , George Harrison , Keanu Reeves , Brad Pitt , Madonna , Barbra Streisand , and Oprah Winfrey .
 Kevin Costner, Whoopi Goldberg, Gene Hackman, George Harrison, Keanu Reeves, Brad Pitt, Madonna, Barbra Streisand, Oprah Winfrey
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Kevin Costner, Whoopi Goldberg, Gene Hackman, George Harrison, Keanu Reeves, Brad Pitt, Madonna, Barbra Streisand, Oprah Winfrey