During the day, Rachel made an appearance on the Today show where presenter Matt Lauer showcased her audition tape for The Notebook circa 10 years ago (talk about a mortifying flashback).
The video has been on YouTube for ages but there's nothing like a little reminder of your former, less experienced self being shared with a live audience.
Not only that, but Rachel reveals that she was star-struck by Lindsay Lohan on set of Mean Girls: "I was in awe of her talent. I looked at her as this experienced actor, and she had great comedic timing" she told the magazine.
"It's just funny to hear that because you never know what people are thinking. We all try to act like we've got it together."
Watch this video to get all the details on what Rachel said about being on set with Lindsay.
MORE! Check out this Rachel McAdams style file to see more looks from the A-list lady.