Patrick Wilson and Dagmara Dominczyk
Walter McBride/Retna Ltd.
08/10/2009 AT 01:40 PM EDT
Patrick Wilson and his wife, actress Dagmara Dominczyk Wilson, have welcomed their second son, PEOPLE has learned exclusively.
Kassian McCarrell Wilson was born on Sunday. "Mother and baby are both happy and healthy," says a source close to the family. "Everybody's great!"
Kassian joins older brother Kalin Patrick, who is 3.
Wilson, 36, who starred in the film adaptation of the graphic novel Watchmen
this year, and Dominczyk, 33, confirmed the pregnancy
The couple, who were both drama majors at Carnegie Mellon University in the 1990s, were married in June 2005.