Maya Rudolph gives birth to new son Jack

Maya Rudolph and husband Paul Thomas Anderson welcomed a baby on July 3, a rep for the actress/comedian tells Us Weekly. The couple's new son, Jack, joins sisters Pearl, 5, and Lucille, 20 months.

Rudolph, who is set to appear on the new NBC comedy "Up All Night," will join fellow castmates Christina Applegate (who just gave birth to daughter Sadie) and Will Arnett (whose wife, Amy Poehler, gave birth to the couple's second child in August 2010.

Back in May, Rudolph joined her old "SNL" castmate Tina Fey -- also pregnant -- for a belly bump and a song about their then unborn children: