Garner, Affleck second baby 'confirmed'

A friend of Jennifer Garner and Ben Affleck has confirmed that they are expecting their second baby together.

Garner's Alias co-star Victor Garber revealed the news to Us magazine.

"Yes, she is [pregnant]," said Garber, when asked about media speculation surrounding the couple.

A source added: "She is five months pregnant. They are very happy."

The couple, who wed in 2005, already have one daughter together, two-year-old Violet.

Garner hinted in October 2007 that she would like to extend her family. "We definitely wonder what it would be like to have another - hopefully, knock on wood, someday," she told Marie Claire.