Actress known for her title role on the television series Nikita. She also appeared in Live Free or Die Hard and in Mission: Impossible III and, in 2014, played the role of Tori Wu in Divergent.
She started modeling in Tokyo at the age of seventeen.
Born Margaret Denise Quigley, she belongs to a family of Polish-Irish-Vietnamese descent. She often posts about animal rights.
She has been in relationships with Brett Ratner and Daniel Wu. She then became engaged to Dylan McDermott. As of February 2019, the couple have split after a four-year engagement.
She co-starred with Ving Rhames and Tom Cruise in Mission: Impossible III.