On Saturday, the National Lampoon star announced his youngest daughter, Emily Chase, 36, is expecting her first child.
“I can’t wait to be a Grandad!” he wrote alongside a photo of himself, Emily, and her partner, Alex Baglieri. “Congrats to my daughter @em_chases and @alex.baglieri ❤️.”
Family, friends, and fans were quick to react to the news.
“Wonderful❤❤❤❤❤❤❤ congratulations! Clark if a boy, ellen if a girl?” Beverly D’Angelo wrote.
While one fan put in a “vote for Rusty if it’s a boy.”
“Your Grandad Era is going to be wonderful. Lucky little baby. ❤”
“Are you serious Clark?” someone wrote, using a line from National Lampoon’s Christmas Vacation.
Congratulations to Emily, Alex, and the rest of the Chase family!