Jim Carrey a grandfather

Reuters

GRAMPA CARREY: Jim Carrey's daughter, Jane Carrey, has had a baby.

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Jim Carrey has become a grandfather.

The 47-year-old actor's daughter Jane Carrey, 22, gave birth to a baby boy at a Los Angeles hospital on Friday (Saturday NZ time) 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 (3.5 kilograms) and is 20 inches (50 cm) long.

Jim revealed his daughter was about to give birth this week on twitter.

On Tuesday, 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."

- Bang! Showbiz