James Marsden welcomes a son

Actor James Marsden arrives at the GQ Men of the Year Party at Chateau Marmont on Nov. 13, 2012, in Los Angeles. / Alberto E. Rodriguez/Getty Images

James Marsden is now a dad for the third time.

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The stork club

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.