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Robin Williams tributes pour in from Hollywood

Celebrities reacted with shock and sadness Monday upon hearing the news of Robin Williams' death, and took to social media to pay tribute to the actor-comedian.

Steve Martin is among those who took to Twitter to express their sympathies, along with Ellen DeGeneres, Ron Howard and Henry Winkler, his "The Crazy Ones" co-star Sarah Michelle Gellar and Mara Wilson, who played his youngest daughter in the 1993 hit "Mrs. Doubtfire."