James Marsden welcomes a son

James Marsden is now a dad for the third time.

Brazilian model Rose Costa gave birth to son William Luca Costa-Marsden on Dec. 14, People reports.

Costa and Marsden "briefly dated" after the "30 Rock" actor split from wife Lisa Linde last year, according to People. A source told the website that Marsden "is being very supportive" and helped choose the baby's name.

Marsden, 39, is also father to daughter Mary James, 7, and son Jack Holden, 11, with Linde.