Jim Carrey is about to become a grandfather! The 47-year-old comedian’s daughter Jane, from his first wife Melissa Womer, is pregnant. “I am very excited,” says Jim. His beloved Jane is 21 years old and fronts a rock group called The Jane Carrey Band. The father-to-be is Jane’s longtime boyfriend Alex Santana, who goes by the name “Nitro” in his own rock band, Blood Money. A close source says, “Jane is ecstatic. She and Alex are now engaged and are thrilled at becoming parents.” Jim married Melissa in 1987 and they divorced in 1995, when he took up with his ‘Dumb & Dumber’ co-star Lauren Holly, whom he married in 1996 and divorced the next year. Jim’s been dating actress Jenny ocCarthy since 2005.