James Marsden is a father for the third time.
Brazilian model Rose Costa delivered a son, William Luca Costa-Marsden, on Friday, Dec. 14 in Los Angeles, PEOPLE has learned.
The 30 Rock star, who briefly dated Costa after his split from wife Lisa Linde in 2011, picked the name and is being very supportive, a source tells PEOPLE.
Marsden, 39, is already dad to daughter Mary James, 7, and son Jack Holden, 11, with Linde.
A rep for the actor could not be reached for comment.