The actor contacted 12-year-old Brody Ridder after learning the boy was insane at his college.
She also shared a note her son wrote to himself on the blank pages, “Hope you make some more friends – Brody Ridder.”
“It was great talking to you the other day,” Rudd wrote in the note posted by the boy’s mother on social media. “It’s important to remember that even when life is tough, things get better. There are so many people who love you and think you’re the coolest kid around – me being one of them. between them! I can’t wait to see all the amazing things you’re going to do. Your buddy, Paul.
CNN has reached out to Rudd’s team for further comment.