The 47-year-old actor’s daughter Jane Carrey, 22, gave birth to a baby boy at a Los Angeles hospital on Friday (26.02.10) a few days ahead of her March 3 due date.
Jane – who fronts rock group The Jane Carrey Band – and her husband, Blood Money singer Alex ‘Nitro’ Santana, have named their new arrival Jackson Riley Santana.
A representative for the actor revealed Jackson weighed in at 7 lbs 11 oz and is 20 inches long.
Jim revealed his daughter was about to give birth this week on twitter.
On Tuesday (23.02.10), he tweeted: “Something beautiful is right around the corner.”
And on Friday he posted: “Right around the corner!”
When Jane announced her happy news last July, Jim – who split from Jane’s mother, his first wife Melissa Womer, in 1995 – predicted his daughter would be a fantastic parent.
He said at the time: “Jane is going to be a great mom.”
The ‘Yes Man’ actor’s long-term girlfriend Jenny McCarthy recently admitted she couldn’t wait to become a grandmother to Jane’s baby.
The blonde beauty – who has a seven-year-old son Evan from a previous relationship – said: “I think I’m going to be the awesome grandma, the world’s best is what I say.”

Source: BANG Showbiz