Jim Carrey, known best for his exuberant energy in films like "Ace Ventura," "Bruce Almighty" and "Liar Liar," is officially a grandfather. The 48-year-old actor posted this tweet on Twitter Saturday: Jackson Riley Santana, My Grandson, Born today! This is what 7lbs.11oz. of Calfornia dynomite looks like! %^> http://twitpic.com/15liwi 1:14 AM Feb 27th via web … Continue reading Jim Carrey is a grandpa!