Casey Affleck Welcomes a Second Child
01/15/2008 AT 03:15 PM EST
No other details have been announced.
Affleck, 32, and Phoenix, 30, who were married in June 2006, also have 3-year-old son Indiana August.
Affleck stars in Gone, Baby, Gone, directed by brother Ben Affleck. Phoenix is the younger sister of actors Joaquin and the late River Phoenix.