A rep for Nicolas' son Weston and his wife Danielle told Us Weekly, "Lucian Augustus Coppola Cage was born on July 1, 2014 at 3:14 p.m."
Lucian is the first child for the couple, who announced their pregnancy in February at the Kasem Cares Foundation fundraiser. The musician talked about how his movie star father felt about the big news, saying, "My dad is ecstatic. He was elated immediately when he met Danielle."
At 50 years old, Nicolas is a relatively young grandparent, and he's also the father of an 8-year-old son, Kal-El, with third wife Alice Kim. So Weston's little brother will be old enough to babysit his nephew in a few years.
The new parents also explained their unique baby name choice, which they had already picked out. The name has a lot of family significance.
Danielle explained, "Lucian is of Romanian descent, which is what I am. And Augustus is taken from Weston's grandfather."
The former lead singer of the group Arsh Anubis then chimed in about his beloved relative. "His name is August. We honor him very much. He was of extreme brilliance. He was a genius," he said.
Weston is the son of the Leaving Las Vegas actor and actress Christina Fulton. The couple dated in the late 1980s.
Nicolas isn't the only Hollywood celebrity to join the ranks of grandparents. Susan Sarandon is just weeks away from becoming a grandmother and Mick Jagger recently became a great-grandfather for the first time.
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