Comedian's daughter Jane gives birth to a baby boy

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Jim Carrey has become a grandfather – at the age of just 47.

The actor’s daughter Jane, 22, gave birth to a 7lbs 11oz baby boy on Friday in Los Angeles.

She and husband Alex Santana have named him Jackson Riley Santana.

‘My Grandson, Born today! This is what 7lbs.11oz. of Calfornia dynomite looks like [sic]!’ Jim, 48, wrote on his Twitter page.

He also posted a snap of the newborn.

SEE TWITTER PICTURE Jim Carrey‘s grandson Jackson Riley Santana here>>