McAdams, 36, is filming the upcoming season two of HBO's hit gothic crime drama with Colin Farrell and Vince Vaughn.
She plays Detective Ani Bezzerides-a hard drinkin', hard gamblin', cigarette smokin' Ventura county cop trying to solve a grisly murder, reported Marie Claire magazine.
"I love that she's not the girlfriend or the wife. She doesn't really care what everyone thinks, she feels no responsibility for other people's feelings. She's not trying to be charming, which isn't always the case with a leading lady.
When asked what kind of character she likes to play, McAdams said, "I prefer to be a villainess. The re's something a bit more delicious about their wickedness.
