Jim Carrey Becomes a Grandpa!

He may be a young 47, but Jim Carrey is now a Grandpa to his daughter’s new baby boy.

Jane Carrey and husband Alex Santana welcome their first child, son Jackson Riley Santan, at 12:28 am on Friday in Los Angeles, CA.

Tweeting about the new arrival, the proud new granddad posted a baby pic and wrote, “Jackson Riley Santana, My Grandson, Born today! This is what 7lbs.11oz. of Calfornia dynomite looks like!”

Back in July, the “Dumb and Dumber” actor said of his daughter, “Jane is going to be a great mom.”