Naomi Watts & Liev Schreiber Name Baby Samuel

Monday December 15, 2008 08:00 PM EST

Watts and Schreiber in 2007

Stuart Ramson/AP

• Facebook
• Twitter
• Yahoo Buzz
• E-mail

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

RELATED ARTICLE:
• 2002: See Naomi's 'Most Beautiful' spread!
RELATED GALLERIES:
• Celebs debut their adorable mini-me's on the covers of PEOPLE!
• Take a look back at Naomi's baby bump style!