Jim Carrey is bursting with pride after welcoming his first grandchild. The Dumb And Dumber star's daughter Jane gave birth to son Jackson Riley Santana in Los Angeles on Friday. 

The funnyman took to his Twitter.com page to announce his happy news, posting a photo of the sleeping newborn wrapped in a blanket with the caption, "Jackson Riley Santana, My grandson, born today! This is what 7lbs 11oz. of California dynomite looks like!" 

Jane is Carrey's only child, from his first marriage to Melissa Womer.

Jim Carrey Photos