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Dermot won the Golden Space Needle Award for Best Actor in the Seattle International Film Festival for his part in "Where the Day Takes You."
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Dermot stared as the voice of Rod in the gleefully outrageous animated feature "Hair High" by Bill Plympton, which openned in 2006.
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In 1993 Dermot wrote the song Someone Else's Used Guitar for Peter Bogdanovich's "The Thing Called Love." Dermot also is credited as a song performer on them movie and for four other tunes, as well as acting in the movie.
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Dermot's sister Moira works in the Philadelphia DA's office as an assistant district attorney.
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In 2005 Dermot played the eldest son who brings his girlfriend, Meredith (Sarah Jessica Parker), home to New England to meet his family in the holiday comedy The Family Stone.
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In 2005 Mulroney starred with Debra Messing in the romantic comedy The Wedding Date.
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Mulroney's TV debut was as the son of newly married widower Bill Bixbey in Sin of innocence.
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Dermot plays cello in the song 'Place Your Hand' from Melissa Etheridge's 1992 Album Never Enough.
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Dermot plays in a band called the Cranky George Trio.
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Mulroney's younger brother Kieran Mulroney is also an actor. The brothers starred together in the John Hughes comedy, Career Opportunities (1991).
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Dermot was once in a band called The Low & Sweet Orchestra.
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Dermot played the cello on the score to 'Mission: Impossible III' (2006).
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Dermot is good friends with Brad Pitt.
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Dermot played double bass and cello on the debut EP of Rain and Summer Phoenix's band.
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Dermot Mulroney is sometimes confused with actor Dylan McDermott; there is a slight resemblance and a similar sounding name.
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Dermot and Rob Schneider have the same birthday.
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Dermot's High School, T.C. Williams High School was used in the movie Remember The Titans.
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Guest starring on the hit show Friends, Dermot played Gavin Mitchell - a work colleague of Rachel whom she dated for one episode.
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Dermot is most famous for his role's in Romantic Comedies.
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Dermot was one of People Magazine's Sexiest Men Alive, 2006. He is found in the "Hooray for Gray!" section.
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During his interview on The Colbert Report, Dermot revealed he didn't meet another "Dermot" until he was thirty years old. Also, he's never met an American with that name, as it's traditionally an Irish name.
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Dermot auditioned for the role of 'Billy Campbell' on Melrose Place.