By Whitney Pastorek
February 27, 2010 at 06:58 PM EST

Jim Carrey is now a grandfather, according to People. Jane Carrey, 22, and husband Alex Santana welcomed first child Jackson Riley Santana at 12:28 a.m. Friday, in L.A. Grandpa Jim tweeted the blessed event yesterday, posting a picture of Jackson and saying, “This is what 7lbs.11oz. of California dynomite [sic] looks like!” In July, he told People, “Jane is going to be a great mom.” Carrey’s spokeswoman tells the actor has no immediate plans to release a statement or do interviews, and that any future statements from him will be made via his Twitter account.