This will be the couple's second child

Another Affleck is on his or her way.

Casey Affleck and wife Summer Phoenix are expecting their second child, report celebrity news sources.

"They're very happy and excited about the new addition to their family," says Affleck's spokesperson Rebecca Feferman.

The baby, who is due this winter, already has a three-year-old brother, Indiana August. perhaps not so coincidentally, is the name of the young protagonist Phoenix's late brother River Phoenix played in "Indiana Jones and the Last Crusade."

Affleck, 32, and Phoenix, 28, met through Joaquin Phoenix, who befriended his "To Die For" co-star Affleck and introduced him to his sister. The couple became engaged in late 2003 and wed in June 2006 in Savannah, Ga.

Summer Phoenix has appeared on "ER" and had roles in "The Faculty" and HBO movie "The Laramie Project."

Casey Affleck was last seen in "The Last Kiss" and "Ocean's Thirteen." He next stars opposite Brad Pitt in "The Assassination of Jesse James by the Coward Robert Ford," opening in limted release on Friday, Sept. 24 and in the upcoming "Gone, Baby Gone," directed by his brother Ben Affleck.