She returned to prominence in 2009 by appearing in the political-thriller State of Play, the science-fiction romantic drama The Time Traveler's Wife and the mystery action-adventure film Sherlock Holmes.
In 2010, Mc Adams appeared in her first star vehicle, the comedy Morning Glory.
She trained at a real boot camp, at Fort Campbell, Kentucky, prior to filming.
"Previously she has been seen mostly as a hot chick or an idealized sweetheart", he wrote.
She also made her Canadian film debut that year in the comedy My Name is Tanino.
In 2005, she starred in the romantic comedy Wedding Crashers, the psychological thriller Red Eye, and the family comedy-drama The Family Stone.
Mc Adams' break-out role came in 2004, when she starred in the comedy film Mean Girls opposite Lindsay Lohan, Lacey Chabert and Amanda Seyfried, based on Rosalind Wiseman's book Queen Bees and Wannabes.
Mc Adams was 25 years old when she was cast as the mean high school queen bee Regina George, and she modelled her character on Alec Baldwin's performance in the drama Glengarry Glen Ross (1992).
She starred with Pierce Brosnan and Chris Cooper in the 1940s film noir Married Life where she played Kay Nesbitt, a young widow who wins the affections of Brosnan and Cooper's older characters.
In preparation for the role, Mc Adams studied old films, particularly those of Kim Novak.
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