By Caitlin Petreycik
Updated Sep 13, 2011 @ 3:45 pm
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Michelle Monaghan spiced up her brunet locks with deep auburn tones. The actress debuted her new red 'do at the Toronto Film Festival premiere of Machine Gun Preacher. See who else dyed their hair this year in the gallery!MORE:Fall Haircut Ideas You’ll Love!Try On Celebrity Haircuts!Elizabeth Olsen Went Blond