Robert Downey Jr.

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U.S actors Robert Downey Jr. (right) and Gwyneth Paltrow pose for photographers during the "Iron Man 3" premiere in Paris on Sunday, April 14, 2013. (AP Photo/Thibault Camus)

**FILE** Actor Robert Downey Jr. poses during a photo call to promote his new movie "Iron Man 3" on the roof of a hotel in Moscow, with Kremlin in the background, on April 10, 2013. (Associated Press)

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U.S. actor Robert Downey Jr. poses with a Iron Man figure on stage during a promotional event of his new movie "Iron Man 3" before its release in China in early May at the Imperial Ancestral Temple in Beijing's Forbidden City Saturday, April 6, 2013. (AP Photo/Andy Wong)

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Chris Evans (left) and Robert Downey Jr. star as Captain America and Iron Man, respectively, in "The Avengers." Disney is planning a sequel sometime after the release "Iron Man 3" and "Thor 2" next year and "Captain America 2" in 2014. (Associated Press)

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Chris Evans (left) portrays Captain America and Robert Downey Jr. is Tony Stark in the new film "Marvel's The Avengers." (AP Photo/Disney, Zade Rosethal)

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Actor Robert Downey Jr. was ready for his close-up Saturday at the premiere of "The Avengers" in New York. (Associated Press)

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Ricky Gervais' jabs while hosting last year's Golden Globes show were termed "hugely mean-spirited" by actor Robert Downey Jr. Expect more of the same on Sunday's telecast. (NBC via Associated Press)

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"Sherlock Holmes: A Game of Shadows" stars Robert Downey Jr. (left) as Holmes, Jude Law (right) as Dr. Watson and Noomi Rapace in director Guy Ritchie's stylized reimagining of Arthur Conan Doyle's beloved sleuth. (Warner Bros. Pictures via Associated Press)

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Robert Downey Jr. arrives with his wife Susan Downey, left, for the Golden Globe Awards Sunday, Jan. 16, 2011, in Beverly Hills, Calif. (AP Photo/Matt Sayles)