03/18/2011 at 08:30 PM EDT
It's about to be three's company for Maya Rudolph.
star, 38, is pregnant with her third child, sources confirm to PEOPLE.
Rudolph and director Paul Thomas Anderson, 40, are already parents to daughters Pearl, 5, and Lucille, 16 months.
"I feel like everyone who has had more then one [child] says you should do it," Rudolph said
in 2009 when she announced she was expecting her second child. "It's nice to have this experience."