Naomi Watts and Liev Schreiber Welcome Son!

Naomi Watts and Liev Schreiber welcomed their son, Alexander Pete Schreiber, on Thursday.

The tot was born at 3:59 p.m. in Los Angeles, and weighed in at 8 lbs., 4 oz., and is 22.5 inches long.

The couple have been dating since 2005.