O'Donnell and wife Caroline
12/18/2007 AT 09:40 PM EST
Chris O'Donnell and his wife, Caroline, have welcomed their fifth child, daughter Maeve Frances O'Donnell.
"Everyone's happy," the actor's rep tells PEOPLE. "Mother and baby are doing great."
Maeve was 8 lbs. and 21½ inches long when she was born Dec. 10 in Los Angeles. She joins sister Lily, 8, and brothers Chip, 7; Charlie, 4; Finley, 1. Grey's Anatomy
alum O'Donnell, 37, who starred in the Golden Globe-nominated TNT miniseries The Company
, broke the news
of his growing brood in August, joking that he and his wife were "just starting to figure out how it works."
Next up, he stars in Kit Kittredge: An American Girl
, due out next year, playing a role he's becoming increasingly familiar with: a dad.