Watts, 40, the star of King Kong and a 2004 Oscar nominee for her performance in 21 Grams, welcomed a baby boy on Saturday, People reported.

Watts and Schreiber, 41, are already parents to a baby boy, Alexander Pete Schreiber, who was born in July 2007.

Watts, who was born in Britain but moved to Australia as a teenager, is currently reported to be working on a remake of Alfred Hitchcock's classic thriller The Birds.

Watts was most recently seen in David Cronenberg's acclaimed 2007 crime thriller Eastern Promises and Michael Haneke's dark drama Funny Games US. -- AFP