The IRL Regina George, Rachel McAdams is officially a cool mom as she's just given birth to a baby boy, Hollywood Pipeline reports.
Her adorbs bubba is her first child with partner, Dear John screenwriter Jamie Linden.
Unlike Kylie Jenner and Khloe Kardashian, the 39-year-old managed to lay low and hide her pregnancy from the paps for a V. long time before word got out.
Further deets including the name of the child are yet to be revealed so we'll be keeping our eyes and alerts on Rachel's Instagram for a potential announcement.
Congratulations, queen B!