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At only 47-years-old, funnyman Jim Carrey is set to become a grandfather. Carrey’s daughter, 21-year-old Jane Carrey, is expecting her first child with fiancé Alex Santana.

Jim Carrey tells RadarOnline.com, “I am very excited. Jane is going to be a great mom.”

Jane seems like she’ll be a great as well as a rocking mom. She the front woman of her own rock group, the Jane Carrey Band, and her fiancé goes by the stage name “Nitro” with his rock band Blood Money.

This child is going to have quite an upbringing. It is so weird that Jim Carrey is going to be a grandfather. Wasn’t he just dating Zooey Deschanel and movie like a year ago? I can’t imagine her with a grandpa. And for that matter, I can’t really imagine his current girlfriend Jenny McCarthy with a grandpa. Well, he’ll be a hot one.

Gallery Info: Jim Carrey and daughter Jane Carrey with girlfriend Jenny McCarthy at the premiere of Horton Hears A Who.