The 39-year-old actress and boyfriend Jamie Linden have welcomed their first child together, according to multiple sources.
A new photo shows the proud parents out to lunch with their newborn boy.
McAdams managed to keep her pregnancy under wraps before it was revealed in February this year.
The Game Night star obviously likes to keep her personal life private. Her and Linder, a Hollywood screenwriter, first sparked romance rumours in 2016.