From Variety's "Births and Hitched" section:
Janel Moloney and Marcelo Zarvos, a boy, Julian Francis Zarvos; Feb. 14, New York. Mother is an actress; father is a film composer.
Congrats!!! Here's Marcelo's IMDb listing, while I'm at it: http://www.imdb.com/name/nm0953616/. He's composed a lot of stuff recently.
ETA: Many thanks to carlieseuss for the tip!