INFphoto.com
Though she has yet to personally confirm the baby news, McAdams revealed years ago that she was looking forward to becoming a mother.
"Having a few [kids] would be great," she told People in 2009. Furthermore, she told the magazine, "My mom is a great inspiration to me...She's a nurse and very nurturing and gentle. She lets me be who I am. Hopefully I can take on those qualities and be as great as her."
Then, in 2015, Marie Claire also noted in an interview with the star that she'd like to have kids at some point. Well, that time has officially arrived!
Congratulations to the mom-to-be!