Watts and Schreiber in 2007 Photo by: Stuart Ramson / AP
Naomi Watts & Liev Schreiber Name Baby Samuel | Liev Schreiber, Naomi Watts
Naomi Watts and Liev Schreiber have revealed more details about their newborn son, starting with his name: Samuel Kai Schreiber.

Samuel – the couple's second child after year-old son Alexander Pete Schreiber – was born Saturday and weighed 7 lbs., 13 oz., the couple's rep tells PEOPLE.

"Both mom and baby are doing great," the rep says.

• Reporting by LIZA HAMM

• Samuel joins big brother Sasha! Leave your congrats for the couple here

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