Jim Carrey has unveiled his grandson to the world.

The Hollywood funnyman's daughter Jane Carrey, 22, gave birth to baby Jackson last Friday (26.02.10) and he couldn't wait to show off the new addition to his family to his followers on twitter.

The post accompanying the picture said: "Jackson Riley Santana, My Grandson... This is what 7lbs 11oz of Calfornia dynomite looks like! (sic)"

Jackson Riley Santana, My Grandson
Jane - who fronts rock group The Jane Carrey Band - and her husband, Blood Money singer Alex 'Nitro' Santana, are both "thrilled" with the new arrival.

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."