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Actor James Marsden Welcomes Son

The actor James Marsden, who stars on the NBC sitcom "30 Rock" and a number of movies, has become a father for the third time, welcoming son William Luca Costa-Marsden. has more:

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.

Image: James Marsden, via s_bukley /